I have a Pixel. However, it also has an extra dimming mode, but it doesn't actually remove blue or anything like that. Just makes the screen go darker.
I use it, yeah. It works great for some trackers, and not at all for others. I also sometimes had to spend some time messing with the IRC settings for some. But I've built up quite the ratio for the sites that it works on.
This is straight up misinformation about Signal. The internet was made in part by the US government, so was Tor. You don't avoid using those, and it's very public knowledge that they were created with help from the feds.
I like FairEmail.