I have 3 Roku Smart TV’s 2 are Hisence and 1 is Phillips, every single one of those remotes are universal, they work for each other’s TV, my Phillips works on the Hisence TV, and the other way around, and the Hisence remote works on the other Hisence TV? Why is it like this, couldnt this be a security risk? For example if I knew someone else who had a Roku Smart TV, my Roku remote would work on their TV as well.
Most(?) of the TVs come with an IR remote. If your remotes don't require pairing (don't have a button in the battery compartment) then they are IR remotes. IR remotes have always controlled any TV of the same brand and some TVs of different brands are really the same under the hood. It's no security risk. You have to have a clear line of sight to the TV to control it.