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They are actually quite aggressive about blocking disposable emails, most free services don't work. I have used protonmail a few times for semi-disposable accounts that used disposable emails to sign up, and some of them were banned later.

Gnome devs being gnome devs.

Archinstall is not at all newbie friendly, especially compared to calamares and endeavourOS setup. Also, having a usblive is very convenient in case of problems.

If you don't have advanced knowledge nor want to customize it very thoroughly, I don't see any reason to use arch over endeavourOS. I mean, other than the fun of experimenting with the innards of linux, testing your frustration tolerance, and ending up being able to say "I use arch BTW".