PSA: Twitter one-click dev subscriptions
All the subscriptions, including $100/month and $5000/month, can be activated with a single click (they have now added the wording to the button). This means there are no refunds if you accidentally click on the $5k subscription. I accidentally did so two weeks ago when it was also the default tab (I had no idea the $5k subscription even existed). They immediately charged $5k.
I opened a support ticket and downgraded shortly after realizing the mistake. However, they did not reply for two weeks and now they are saying there are no refunds whatsoever. It's a real nightmare, and I would advise anyone to be cautious when doing business with Twitter at this point. I have had unexpected charges with GCP, AWS, Vercel, and others, and they have always been handled gracefully. I'm at a loss for words and hope that this will at least raise some awareness of how much the new Twitter values its developer community.