Because, of course it was.

If you didn't see this coming, you need glasses.

In a press release announcing the decision, Twilio revealed which services Parler was using. This information allowed hackers to deduct that it was possible to create users and verified accounts without actual verification.

With this type of access, newly minted users were able to get behind the login box API used for content delivery. That allowed them to see which users had moderator rights and this in turn allowed them to reset passwords of existing users with simple “forgot password” function. Since Twilio no longer authenticated emails, hackers were able to access admin accounts with ease.

Parler although probably well intentioned have been incompetent from the start. you needed to submit your Social Security Number and a photo of your driver's license to access some features. Crazyness

Too much work for general shit-posting. It's not like you're filing your taxes or applying for a mortgage.