Yes it's actully like that. Those services get blocked but why do I have to use a third party when you can just make emails optional. If many users dont feel comfortable giving up their email, just make it optinal. You cant expect my support when you don't care about forcing me to jump through hoops because you don't care about my privacy preferences.
I'd genuinely be curious as to some statistics about how many users do feel strongly about using an email / generating an email. I get that you feel that way, but to what extent is it a common feeling?