I hope someone will take action against all these three companies but I don't think the laws have been written to deal with this.
Are you sure about that? On Android my default browser is Firefox. If I email myself https://detectmybrowser.com/ and then open it in the Fastmail app on Android, it says I'm using Firefox.
I agree that Apple and Google are also guilty here, but MS is repeating actions which there is not only a direct legal precedent against, but one which involved them as the defendant.
The issue wasn't what they did, it was what they did in combination with their monopoly of the desktop market.
Apple gets away with what they want to do because they're a minority player in both the desktop and smartphone markets. It will be interesting to see how this changes with Epic's attempt in court with redefine the market to a fraction of the market.
Would "but Apple is doing worse" really work as a valid defense in court? Wouldn't it just provoke another litigation against Apple (if the court decided smartphones should be treated in the same way as personal computers)?