After being taken offline last month.
Last month, Switch emulator Ryujinx was forced offline after Nintendo contacted its owner to arrange its removal. While there were rumblings that the emulator might not be completely dead a few weeks back, it seems that Nintendo has now taken official ownership of the website, presumably to stop anything from reappearing under the same domain (thanks, GamesRadar).
This change in ownership was flagged on the r/Ryujinx Reddit forum by user XeClutch, sharing a screenshot of the WHOIS database website which positions Nintendo of America as the emulator's main 'Registrant Contact'.
Read the full article on nintendolife.com