Another argument is that it could lead to a bot problem 10x worse than twitters ever was.
Evidently the people running the bots don't really care whether or not you give them an API to work with.
https://www.reddit.com/r/webscraping/comments/w1ve97/virgin_...
I would usually get support to manually unlock it after a few days by emailing them and mentioning why I didn't want to give them a phone number. Now the process only involves solving captchas. (and maybe some hidden waiting)
As an example my feed is completely free of US politics, allowing me to curate an experience where I can go to enjoy myself instead of constantly being exposed to ragebait.