I can say I have, used to see a lot of propaganda from my country being constantly crossposted from ml and hexbear, since dbzero (among others) tolerates them, it helps them bypass the faulty defederation/blocking system that lemmy has so it kept appearing in my feed and I had to see accounts dedicated to defend the propaganda.
Until I moved to Piefed and was able to actually block them (also this instance defederated them).

Tribalism isn't always bad, sometimes it's needed to help take care of others by cutting off bad instances or instances that enable them. It's not black and white.