It’s funny they are talking about low hundreds of emails. This is what a single properly instructed human can create with any provider in a few hours, no bots needed.
* 2025-06-09 first user account created, verified, 2FA set up, API Token provisioned
* 2025-06-11 46 more user accounts created over the course of 3 hours
* 2025-06-24 207 more user accounts created over the course of 4 hours
I do run https://bademails.org , powered by the same disposable-email-domains project, and I'll be the first to say that it only cuts out the laziest of attempts. Anyone even slightly serious has cheap alternatives (25 to 100+ accounts for $1 on popular email hosts).