Because Deno turned into some quirky serverless technology.
replyCF has its own quirky serverless technology and has no interest in funding any competition, even/especially in such sad shape as Deno is
Deno is a excellent and quirky severless, server, CLI, library, and GUI technology.
replyCF workerd is only one out of those 5.
I mean, sure, but this doesn't preclude CF from keeping a few people around who can work on the runtime while everyone else does... whatever CF wants them to do.
replyThey don't even need to be the long term stewards either. Spend some time setting up a proper governance structure for Deno, hand it off, and then pay some maintainers to continue their existing effort.
At least how it's stated in the post, it really feels like an "ah good luck everyone, I'm out!" sorta deal, which seriously sucks for everyone who really believed in Deno.