It's a well-developed fascist strategy of destabilization.
Here's a choice excerpt from "Elon Musk's Machine for Fascism: A Tale of Three Elections" recently published on emptywheel.net:
From trial testimony, regarding hashtag hijacking....
"Itâ(TM)s like if you have a hashtag â" back then like a Hillary Clinton hashtag called âoeIâ(TM)m with her,â then what that would be is I would say, okay, letâ(TM)s take âoeIâ(TM)m with herâ hashtag, because thatâ(TM)s what Hillary Clinton voters are going to be looking at, because thatâ(TM)s their hashtag, and then I would tweet out thousands of â" of tweets of â" well, for example, old videos of Hillary Clinton or Bill Clinton talking about, you know, immigration policy for back in the â(TM)90s where they said: You know, we should shut down borders, kick out people from the USA. Anything that was disparaging of Hillary Clinton would be injected into that â" into those tweets with that hashtag, so that would overflow to her voters and theyâ(TM)d see it and be shocked by it."
"In the 2016 election, this methodology served to take memes directly from the Daily Stormer, launder them through 4Chan, then use Twitter to inject them into mainstream discourse. Thatâ(TM)s the methodology the far right still uses, including Trump when he baits people to make his Truth Social tweets go viral on Twitter."