There are some ways to mitigate the majority of that kind of stuff: You can disable image hosting, defederate from instances with poor moderation or poor attitudes, filter out certain keywords, use cleanup tools like from dbzero. Not sure if the caching still occurs if you disable pictrs hosting tho
Combining: bans, blocks, defederation, differing lemmy versions and federation bugs / glitches, you end up with a different view (sometimes for better or for worse) than someone on another instance