What I recall from the discussion back then is, that domain fronting basically means, that Signal would disguise itself as google or amazon traffic. So I would

What I recall from the discussion back then is, that domain fronting basically means, that Signal would disguise itself as google or amazon traffic. So I would say, it is understandable, that they decided this is not good for their buisness. 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.