1) There aren't shares to own. He owns some urbit identities, which will be worth real money IFF urbit is ever actually popular, which doesn't seem very likely at the moment.
2) You're calling a real live human being racist. Are you sure you know him well enough to stand behind an accusation like that? Or are you relaying third-hand opinions about his blog? I'm not a fan of his, but the blog posts that launched the #cancelyarvin effort seemed pretty innocuous to me.
Staying well clear of 2), but to address 1): Tlon is an ordinary corporation and I would be flabbergasted if cgy didn't retain shares in a corporation he founded.
Then there's address space, and my understanding is that he gave up control of his galaxies, which doesn't say anything about the stars and planets that were in them.
With a little spelunking in the old codebase, and inspection of the Azimuth contract, someone interested in the question could no doubt answer it with reasonable confidence.
Oh, I'd forgotten about Tlon. Well, I looked it up, and what he claims to retain is "a few thousand stars" and a "non-voting minority in tlon". I guess the latter could be valuable monetarily (in some hypothetical future in which urbit is successful, anyway).
https://en.m.wikiquote.org/wiki/Curtis_Yarvin
I think this collection of quotes should serve as evidence for his malignant idiocy.
The success of Urbit could still be enriching its racist founder sitting on a founder-sized set of tokens or equity, even if he never worked there.
I’d much rather just participate in other projects.
EDIT:
...as of last I looked, there had been no statement. I’d still simply rather involve myself in other projects and communities, as it sounds like he would still benefit from the growth of the system, and I don’t think I’d get along with his compatriots that are still working there.
I try not to work on things where doing a good job means that someone who wants my friends to not have human rights makes more money for their cause.