In the hotels I stayed at in Europe it's usually a standard non-smart TV plus a custom board that connects to it over HDMI. Sometimes the whole thing is enclosed in some kind of plastic shroud that clips over the TV but nothing a bit of "percussive maintenance" can't fix. From there, the HDMI port is accessible.

However, in most cases, at least in mid-range rooms, the TV is barely bigger than my laptop so it just doesn't make sense to use it.