It has been happening for a while with a bunch of startups like Supabase claiming to be "open source" and marketing themselves as such but making it really hard to self host for a long time.
It wasn't just them either.
I would see with disgust a bunch of startups use "open source" as their marketing tactic, no matter how hard it was to setup or run without their hosted service.
It is also a peverse incentive: the harder the open source system is to run and maintain, the more you will gravitate toward their cloud. Supposedly open source companies raising a ton of money from VC is also strangely contrary to the open source ethos.
Deno KV is basically the next jump in that chain.
Richard Stallman was right once again, as usual.