Same, the email alias feature is huge.

Adobe software, autoCAD, and anticheat are the top 3 reasons I usually hear. While there are alternatives for the first two, people who need these specific tools professionally don’t really have the choice.

Anticheat for gaming is a big one too. Personally I didn’t even consider switching until I finally quit Destiny 2 for good. If the main game someone plays just doesn’t work, they’re not gonna switch.