I think this claim is inaccurate in two ways. The first is that this is a decision that is up to the president of the United States. For the most part, companies like T-Mobile are subject to regulation but their terms and conditions are written up by the companies themselves. In this case T-Mobile adheres to standards set by the Cellular Telecommunications and Internet association (CITA), which is a trade association and interest group representing American telecommunications and Internet companies. You can read about CITA, and see the "SHAFT" standards mentioned by the tik-tok here:
CITA Website
CITA handbook mentioning SHAFT
The other inaccuracy in this claim is the policy and fine itself. It is clear that the T-Mobile terms and conditions for regular customers says nothing about SHAFT standards. There is a brief mention of T-Mobile's right to terminate messaging programs done by third parties in its code of conduct though. I have linked both below.
Terms and conditions
Code of Conduct
There is also a solid fact check done by the AP on this if you still need more information.\
The poster of the tiktok makes a lot of content like this: Misleading and inflammatory misinformation. He also hosts a talk radio program, which seemingly has much of the same content. Its unclear if this person is trying to utilize outrage ton tiktok to promote himself, as he makes no mention of his radio program in most of his videos, but does link to the show in his profile. This doesnt seem like an organization or group, but rather an individual disseminating (knowingly or unknowingly) misinformation which aligns better with his own worldview than the truth.