Correct, both Google and Amazon told Signal not to use them for domain fronting: https://signal.org/blog/looking-back-on-the-front/
We really should not have let the majority of internet traffic be served by a small handful of giant companies without some legal protections as to what they're allowed to do.
But I would be 100% against any law that required them to allow domain fronting. It's fine if they want to, but requiring them to basically open up/leave open a hole in their systems is not right.
I'm really bothered by blanket policies that prevent beneficial uses of a tool because it can also be used to cause harm. Google and Amazon need to figure out how to disambiguate the two.
So it was not an act by google and amazon to activly harm Signal, but rather canceling ongoing support of Signal, that could put their buisness to harm, which is something different.
In the grand scheme of things, I don't like how much infrastructure technology giants control.
In this specific case, however, domain fronting is basically saying "if you want to ban me, you have to ban all of us", without asking if the rest of "us" consent to be put on the same boat.
It would be cool if they are, but it's perfectly understandable for them to disagree.