It was a Covid thing that must still be being enforced by some subs. The term has to do with questioning the logic behind lockdowns, mask effectiveness, the lethality/severity of catching covid, and the effectiveness of the MRNA vaccines. When subreddits started doing this I got preemptively banned from a whole slew of subreddits over the course of like a week. Just because is was active in subreddits like conservative and lockdownskeptics