He may not be clear of Twitter enough to do something like this. I’m wondering if a public action like that coukd open him up to some legal jeopardy. Just a guess.
He also plainly stated that the thing he wants to start is a protocol, not a company, so it is hard to class it as “a competitor” in the traditional sense.
Your anti-cryptocurrency bias is blinding you to the fact that neither party to these conversations needs or wants any more money than they have presently.
When you're a multibillionaire and you're still building new shit from scratch, you build to build. Monetary gains are a side effect.