This sure seems like an overreaction to me. But, maybe I don't get it.

What it looks like:

This feature allows anyone to pay miners out of band using bitcoin to include a transaction in the next block. The only thing that is different about this to me is that they offer an interface for doing this out of band vs. using the protocol.

What is the harm? That this happens out of band? Fee bumping is something I've been experimenting with this last week. In principle this seems to me to be no different in principle. Honestly, this almost feels like a joke. A prank. I mean, you can do this with RBF now without Mempool.space

Most importantly, I don't see how this could ever be prevented.

What am I missing?