At the bottom of the page click "instances" and scroll down on that page until you get to "blocked instances".
The great part of the fediverse is that everyone can use whatever they want. Personally I stick to Foss clients though.
Not on fdroid yet, it is available on their codeberg repo. https://codeberg.org/Bazsalanszky/Infinity-For-Lemmy/releases
https://codeberg.org/Bazsalanszky/Infinity-For-Lemmy APK is in the releases tab, works surprisingly well given how new it is.
Probably the cable tbh, could be the power brick if it doesn't have the right voltage but I would lean towards it being the cable.
Nah I don't think it is miracast. I tried it on my car with exclusively miracast support and it wouldn't do anything.
I find it notice it the most on phones, like a huge difference for me. Not as much on PC monitors though.
Literally like the only choice for maximum anonymity