Do you call a lot of upvotes ‘bulk upvoting’?

Yes, but that sort of behaviour is far more socially acceptable on the Fediverse.

I don’t bother blocking a community until I recognize the name because a single post might not represent the community.

I mean given your zeal, I assume any community you see that is basically AI-slop - you'd block out of hand.

There are enough slop posts in communities I do like that my default is to just down vote and move on unless there is a pattern. No, I don’t double check the user name and community for every post.

Then that puts you at potential risk of being community banned down-the-line if you are seen as a repeat downvoter without contribution by the community owners.

Why should I go out of my way to do extra stuff instead of just down voting and blocking when I feel like it? They are the ones impacting everyone by spamming slop nobody wants.

You don't have to do anything, but just that downvotes on the Fediverse are public to community mods and instance admins and some make use of this to ban repeat downvoters.