Yes, launching the game launches Ubisoft’s launcher and you have to sign into that to play.
Also if you use Proton it doesn’t auto close the launcher when you quit the game so it’ll run up your play time while the launcher is minimized to the system tray.
Oops forgot to post links, I edited the post.
I host Alexandrite at https://alexandrite.app/ and several instances also host Alexandrite on their own domains, like https://a.lemmy.world