I don't believe I've ever seen/discussed the three arrows as an anti-communist symbol today though.

Honestly I agree with you there, but I can't help but get (fairly) imo irked when I see someone, in need of an antifascist symbol, reaching for the explicitly anticommunist one as... and eyebrow raiser to say the least. Especially considering there are a lot of other ones that just... aren't explicitly anticommunist? Why go for the 3 arrows when you can just go for a instead?

I've definitely seen libs use it according to its original meaning online, along with lots of other "both sides" memes.

The context I've seen it in today, I still would not trust anyone who uses it as they are, at best, an extremely naive radlib who moves in fed-adjacent circles (if they move at all, this symbol is very popular among do-nothing chomskyite office worker radlibs to put on their car. Not so commonly seen on the street amongst the actual antifa movement).