I work in crypto and see Sim swaps happen all the time, mostly for Twitter account takeovers of famous people where they then post phishing links and steal their followers coins. T-Mobile is easily the biggest offender for this, most people reporting they use it, so this has been going on for a long time.

The other big problem with Twitter security is you can have your account taken over even if you use non-sms 2FA! If you have your phone number on your account it can be used for recovery completely bypassing 2FA. They've had this security flaw for years and still haven't fixed it.