For what purpose though? They add no value as they have 0 engagement. But as long as they are posted on dedicated instances and accounts marked as bots, I have no issue with them.
There are some niche communities that still have posts that I would like to see (articles, new ai tools, etc..). I much prefer to stay here instead of going over to reddit to check on stuff, so it would be useful for me to have the top posts of those subs automatically stuck into a community over here.