Antitrust laws aren't nearly as strong as they were in the 90's. That and this isn't being done to hurt other AI manufacturers, at least not directly. Copiolot is a licensed version of ChatGPT after all. It was Netscape and a couple of other browser developers that brought the lawsuit up in the 90's.
Sadly, consumer protection laws are also a fair bit weaker now than in the past... Looks like we may have to look towards the EU to save us(and then Microsoft will likely just have a separate build for the EU)