[techjuice]

If you are in the USA, you can sue for whatever you want, but you have to be the one to prove the actual law was broken.

Meta has the right to stop business with anyone they set for any reason at any time.

If they don't want you as a customer due to something your business was doing or customers you were attracting they can stop providing services to you which is not against the law. There could have been an accidental ban due to the algorithm they used, but this may also have been a risk threshold breach and it was not worth continuing business with your company due to the threshold being breached.

[codingdave]

You don't sue because laws were broken. When you sue someone, it is a civil case, not a criminal case. You are examining case law and contracts to determine whether there is a viable torts case or contract violations that would result in you being able to prove enough damage that it is worth going to court over those issues.

So, no, it is not necessarily true that meta can stop business with anyone at any time for any reason. It is not necessarily false, either. As any attorney will tell you: "It depends."