Interesting, thanks for that.

The first link you posted states that the master key is stored. It also states that the information on the page doesn’t match the official blog from Signal, but that they’ve gathered their information from the source code, so I assume it’s correct. It does make me wonder why Signal doesn’t say that they store the master key though 🤔

Do you have a reference for Signal using SGX for keys?

Everything I could find was about metadata and private data, e.g. contact lists (which is what the SVR thing that you mention is), but nothing about keys.

Pixel 7 owner here. I’m very happy with my phone and will gladly get a new pixel when this one dies.

Pretty sure both of those were for financial reasons (easier reporting requirements etc). As in, both Google and Facebook the companies still exist, it’s just that they are now owned (along with other companies such as Waymo and Instagram etc) by Alphabet and Meta respectively.