I generally oppose services requiring phone numbers, just to fuck us over.
When will plebs understand its NOT for security, but to get data from you easier & not allowing you to have more than a single verified account?
It's so easy to social engineer your way into getting someone's phone number & then getting access to all important centralised shit services, like Google, Amazon & Microsoft products registered by the victim, who lost his phone number through a social engineering attack.
There are tons of people who lost so much, due to this.
If services actually want security, they need to implement hardware key, TOTP & GPG support. This would be implemented by those monopolies, instead of the requirement for phone numbers, if they actually gave a damn about your account security.