So apparently Twitter has been refusing to pay it's Google Cloud contract, which ran out at the end of June...

https://theconversation.com/twitter-is-refusing-to-pay-google-for-cloud-services-heres-why-it-matters-and-what-the-fallout-could-be-for-users-207718

EDIT: It looks like they resolved this recently, see comment below. So I wonder why the drastic change.

Thanks, I updated my comment