I reached out to the admins to ask why they did it, and they say the stuff I've been posting has repeatedly violated their content policy. They won't give me more info than that. It's really become impossible for a non-liberal to use that site.
Here are all the things I posted in the past 2 weeks:
https://www.reddit.com/r/Documentaries/comments/w9omm2/strike_when_britain_went_to_war_2003_when/
https://old.reddit.com/r/veganarchism/comments/wfv6j1/a_comprehensive_radical_reading_list/
https://old.reddit.com/r/Anarchism/comments/wbqu3d/anarchytube_the_anarchist_video_host_federated/
https://old.reddit.com/r/Anarchism/comments/wdmg7a/living_communism_anarchistnewsorg/
https://old.reddit.com/r/Anarchism/comments/wdmvkd/toby_shone_and_the_spectre_of_anarchist_terror/
https://old.reddit.com/r/Anarchism/comments/wdmh9a/an_anticiv_critique_of_postciv/
https://old.reddit.com/r/Postleftanarchism/comments/wdnkvw/why_hope/

Potkea wrote (edited )
RIP 107a.
Hope you can re-join as 107b or 108a or smthn.
EDIT: Maybe the admins suspended u bc they think ur ziq