I also observed the same thing as you in non-political communities .

Sadly, I had never seen it happen in any political community here…

I don’t want to look in Mastodon for the posts I saw doing this as it would take some time, but here is an example from my experience on Lemmy.

I posted it for the sake of alerting people here.

I believe that people here are smart enough to not fall for Bitdefender marketing.

I post also on the cyber security community articles from antivirus vendors that contains a valuable info, with the same belief that people won’t fall for marketing.