Have you tried making any accounts online these days without a phone number? Good luck — there are extremely few services left that allow it due to “abuse” and other nonsense.
My favorite case of this is that you used to be able to create a google account through android without a phone number. Assuming this is still possible, if you do this your account will be immediately suspended for “suspicious activity” and require a phone to unlock.
I use one service that requires a phone number: Signal. I'm doing alright on the internet. If your service requires a phone number to sign up, I will not use it, period. If more people thought like me this would be a problem, but the majority seems hell bent on spreading their cheeks for peanuts these days.
My favorite case of this is that you used to be able to create a google account through android without a phone number. Assuming this is still possible, if you do this your account will be immediately suspended for “suspicious activity” and require a phone to unlock.