From Nostalgic Torrents' news page:

Yesboff had major database issues.
They're starting from the ground up again.
Someone also hacked the shit out of it by getting it into dev mode..
No idea how that happened behind cloudflare.
If you want to support the dev team 12aB1hxqwURo7fk9PFCdXzy2qvHLHuzMkQ
It might not come back as it's hard to build on a budget/little time.