Brought my Chromecast with Google TV to a Hotel, TV is framed.
Fuck my prior preparation day with the Chromecast with Google TV before the hotel checking....
I don't travel too often so my Chromecast needed some tweaking (AKA updating system and apps etc), I like to take it as a travel companion and found out this shitty frame around the TV.
It is the first time it happened to me, I can see this being annoying for frequent travelers.
I was at a Courtyard by Marriott and they had a fully accessible TV that allowed me to connect my SteamDeck and play from the bed. I will definitely stick with Courtyard for my business travel just for this alone.
Probably not custom. Many brands allow the tv to be put into hotel mode. If you have your own remote (or an IR blaster) then you can take them out of it.
Still not definitive proof necessarily. Splashtop used to sell their custom OS to most the motherboard vendors. They usually rebranded everything but it was still the same OS.