While trying to create an account on https://mas.to https://mas.to, I realized that Google disabled my newly created gmail address ... for violating Google poli

While trying to create an account on https://mas.to https://mas.to, I realized that Google disabled my newly created gmail address ... for violating Google policies or using a bot for creating the account (not of which are true I think). Why does Mastodon require an email for signup?