Some communities there are literally calling for the annihilation of Ukraine
https://programming.dev/comment/1999097
edit: Since people are either willfully or otherwose are missing my point, this is a pro-russia, pro-fascist hate group, therefore we shouldn't give them the platform to spread their shit. this is not about me seeing their community or then causing issues accross other communities, it's about de-platforming fascists.
Some apps let you do that (Liftoff, others).
Yup. I switched over to Sync mostly for their filtering features. You can filter keywords, domains, instances, users, and communities.