there's no reason the rest of us can't continue here as before, without it.
That's OP's point. They won't just siphon users. They will profit off of our content, while providing nothing in return, and intentionally breaking things to ensure the network never grows larger than a certain amount.
Offers for help should be treated the same as offers from a country you are actively at war with. No instances should federate with any Meta own/operated/controlled system. To do otherwise is suicide for the fediverse.
We should also avoid building on technologies they control. Even if OSS, they can knowingly introduce bugs in updates that only break fediverse tech and not meta tech. Which is exactly what the examples in the posted article did. Microsoft did exactly this, to ensure dominance in document file formats.
It seems really stupid from our perspective. Maliciously petty, but our paychecks don't depend on the success of the fediverse, while theirs does depend on it's failure.
These are not compatible communities, due to the owners of one.