[maronato]

Disposable email domains aren't the issue here. Creating a disposable @gmail account to avoid paying is possible too. Don't use emails to assert user identity. Most companies use credit cards for that. Or make it so that creating another account from scratch is more of a hassle than paying. Better yet, offer free tiers.

[lategloriousgnu]

You can only create a small number of gmail accounts, since ever account needs to be linked to a valid phone number. Google actively work to prevent using their platform in this way.

[srg0]

You can also pay $2.40 for a domain name for a year and have your own disposable email service.

[NorwegianDude]

You actually don't need have to have a phone number to use Gmail. You can skip that step.

[usr1106]

I don't think so. I have numerous old Google accounts with their passwords in my password manager. Not for gmail, but for Google Groups lists, Google+ and various other services that no longer exist. Whenever I log in (in an account container of course) I cannot continue without adding a phone number. Have not found a way to skip the step (well, have not tried for some months now, trying to avoid Google increasingly). None of the accounts has stored any data. I would understand that Google would block people from misusing them as free cloud storage.

[usr1106]

Where could I get disposable phone numbers from at a reasonable cost? So that I can receive just the first SMS. These are not valuable accounts, I don't need password reset years later.

[aaaaaaaaaaab]

You can use protonmail.