There's a new kind of dubious account around the fediverse, that only posts capybara pictures. Not sure what their deal is, but this ain't good. If one of those follows you, background-check the domain right away.
A trick bad people seem to use lately is to show an error message (probably fake) in the browser if you look directly, while the server actually works. If that happens, use a search engine; most likely you'll find them already on another instance's blocklist.
The social network of the future: No ads, no corporate surveillance, ethical design, and decentralization! Own your data with Mastodon!