They have a different video of the same theme/place, but they are literally using the same thumbnail as me. They didn't even bother removing my logo from the thumbnail lol.

TBH, my video isn't in the thousands of views but it still annoys me that he/she is using my exact thumbnail without permission.

Should I really care? If I should, how can I remove it? I posted a comment on their video asking them to take it down, will that do anything?

For context, I make walking videos. This other person also made a walking video of the same place but used my exact thumbnail. The videos are different, but the thumbnail copy/paste is blatantly obvious.

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***Edit turns out this channel is taking walking videos from different YouTubers and using thumbnails from other YouTubers, and mixing them together. They haven't used any of my videos but they have videos of several walking YouTubers I know.
So basically stealing videos from others and posting them as their own.