I think Deno’s VC money ran out (see the layoffs a few months ago) and Cloudflare offered a stable, well paying job, maybe with stock options.

Just this morning I checked the Deno blog (again like so often in recent weeks) to see if they are still alive. The number of mentions in Hacker News posts and comments was zero in recent weeks. The project was basically dead or abandoned already. Sucks, because I went all-in on Deno.