I haven't run into this until a few days ago. A fair amount of the titles shown in the various categories on the front page and in the "Newly Added" section lead to a "This title is currently unavailable in your region." message upon trying to play them.

I tweeted at them, but they just redirected to their support email I fired off an email but thought I'd check here on the off chance someone knows of a solution, or can confirm that they promote region locked titles in regions they aren't licensed for.

If anyone is in the UK and wants to check, Evil Dead 1&2 were unavailable for me.

(Troubleshooting I tried: No adblockers/VPN, cache cleared, different browser, relogged, restarted etc.)

Ta
Z

UPDATE: Got a response to my email.

Thank you for contacting Shudder! ​
Thank you for gathering this information. We are forwarding this to our media ops team to resolve the issues you are experiencing.

Please let us know if you have any other questions!

Best wishes, The Shudder Team

EDIT 2: Shudder Team responded here. I only use desktop but fired up BlueStacks and tried the app on there and none of the titles I were having issues with were listed. So I guess that means I'll have to go elsewhere for the 4 or so movies I wanted to watch after all :(