This is a post by u/danpetman over in the r/realscatplay sub. I figured it applied here, so I’m pinning it to top of the sub. Hope this helps!

It's inevitable that in a niche community like ours, people will try to take advantage of the lack of mainstream content producers and platforms, and try to resell stolen content, rip off buyers and generally be shitty. With r/scatporn2 and r/girlspooping both being (hopefully temporarily) banned, r/realscatgirls and r/realscatplay are getting a lot more attention, and with more traffic comes more scammers, so I wanted to try and provide some general tips on avoiding them.

Over my years moderating this and other subreddits, a few common warning signs have shown up a lot, so I figured that listing them here might help users avoid being scammed. These shouldn't be taken as set in stone, and there are inevitably going to be some scammers that don't match any of them, and some legit sellers who do match some of them, so please don't put too much weight in them.

• Default username. By this I mean a username generated by Reddit using their "two words and some numbers" template. Legitimate sellers want and need brand recognition, so they're more likely to use the same username on multiple platforms rather than having some random name on Reddit that's unrelated to their twitter/scatbook/etc. Some examples of recently banned scammers on subreddits I moderate are: Klutzy-Border-2635, No_Oil_3919, Big_Art2859
• Any posts on karma-farming subreddits. This is a tactic used by bot accounts and scammers to get around karma restrictions on some subreddits. Of the dozens of scam/fake accounts I've banned in the last few months, almost all of them started off posting to karma-farming subreddits.
• Using Onlyfans for scat content. Onlyfans does not allow scat content or discussion of scat content. If someone is a legitimate scat content producer, they will not be using Onlyfans for it.
• Not having a store on a reputable scat selling site. By this I basically just mean femscat, scatsy, loverfans and scatbook/darkfans. Scatshop has lost all legitimacy at this point, and other sites aren't as known/trusted in the community. Honestly, even scatbook/darkfans is a borderline case for me in terms of reputability. If someone is serious about making and selling scat content, they'll have an account on at least one of those sites. Doing business directly with sellers can get you a better deal or help support them more, since there's no site to take a cut, so don't take this to mean that you should only do business through those sites, but if a seller doesn't even have an account on any of them, I would consider that suspicious.
• New accounts. Everyone has to start somewhere, but brand new accounts with no established presence are inherently a risky proposition. The chances of getting scammed by someone who's been consistently posting on the same account for 2 years are way lower than the chances of getting scammed by someone who made their account a few weeks ago.
• Lots and lots of posts to different subreddits. By this I specifically mean different posts, not the same image/gif reposted to multiple subreddits. If a human is behind the account, it's more likely that they'll focus on a relatively narrow range of content on a relatively small number of subreddits, whereas a scam or bot account will have no problem posting dozens of different images to dozens of subreddits in a very short amount of time.
• No new or custom content/only pre-mades and dropbox links. This is often a sign that someone is selling stolen content. Since they're not the person in the videos they're selling, it's not possible for them to make any new or custom content. The really insidious thing about this kind of scammer is that they can build trust by actually delivering the premade content you pay for, then once that trust is established, offer to do a custom and then take the money and ghost you.
• Cheap customs videos. What counts as "cheap" is relative, but generally, if an offer sounds too good to be true, it's because it is. Legitimate content creators know the value of their time and work and charge accordingly. A scammer will charge just enough to make it a tempting offer, since they know they're not actually going to have to deliver anything.

If anyone can think of some other good rules of thumb that I've missed here, or if any of the above points need clarification, please let me know. The main takeaway is really just "be careful, check sellers' post history and don't believe things that seem too good to be true."

EDIT 10/04/23: Checking if a user is listed as having been banned due to scamming on other subreddits is a very sensible first step before doing business with them.