It's funny, but I've got the opposite problem... I'm working on a personal/hobby site, and I want the authentication to verify a person's sms/phone number. It's mostly going to be a community site (think online BBSes) and I want to minimize the risk of bots.
I decided to go with Twilio for this purpose, solely for SMS 2FA, but twilio is entirely geared to supporting businesses with marketing campaigns and I cannot seem to get my number verified to be able to send SMS messages for a website that doesn't yet exist.
Always the same issue for hobby sites. Was hoping to recoup the cost of two domain names (one real, one typo catcher) and cheap hosting by putting ads on a search engine for lyrics. Site could not be verified because it "has no content". Says Google. They did no searches but just complained it's a clean page, as though a clean search engine homepage is foreign to them. I was surprised by the stupidity and mildly annoyed by the hypocrisy but didn't care enough to pursue it further