Is the name onecom already taken? I so want to use it for my, never to be launched, start-up!

Well, there's one.com, which I believe is a fairly honest hosting provider.

Yeah, I have talked to some people who work there and as far as I can tell they seem like a pretty legit company.

onecom.com has a nice ring to it, too, doesn't it? Added benefit of looking like a scam-rip-off for one.com!

There’s a .world TLD, so you could collect them all with one.comcoin.world

Honestly, I would go and reserve that domain if I were you! That thing only can go to the moon!