Yes, 100% agree, and yes it is unlikely and it would be difficult for miners to coordinate all of them.

But still, if it would mean more revenue for all of them in total (as long as extra fees from real transactions that go to miners within the scheme >= fees from fake transactions those miners pay for)

It might be worth the endevour right? For example an entity to charge miners a fee (for broadcasting/bumping these fake txs that raise the sat/vbyte for the next block) and in return all miners get extra revenue from real transactions that were bumped or broadcasted with higher fee by users.