This is the first time I'm hearing about tildeverse and it seems cool as hell. Going to sign up.
It's really neat! Fairly active and cool CLI things to do on it. I also have an account on cosmic.voyage but haven't had time to really write more, unfortunately :/
Also it would be a shame if those emails ended up on some left wing mailing lists. :shrug:
They used one of those auto-generating anonymous emails (eg guerilla mail) so pointless if my fingers somehow copied their email... damn shame
There's always nushell. It's fairly new, not quite to 1.0 yet (0.96.1 at time of writing), but the constant breaking changes seemed to have stopped. It hits all your points and it's quite fun to use when writing scripts. Bonus that it's also pretty much tailor-made to manipulate data.