[newusertoday]

i doubt 80% figure. Email is constant source of abuse and requires additional infrastructure so more and more indie products are sticking to social logins only.

[pembrook]

Why wouldn’t the abuser just create fake gmail accounts?

[newusertoday]

it is tougher to create fake gmail account than temporary email account in your own domain or using services that provide temp emails.

It also prevents from mass creation of email accounts for probing services as google is likely to detect that.