So, is the Switch (in certain circumstances caused primarily/only by this game) breaking 1, or is the Roku breaking 2? Neither seem to have broken either until this particular interaction.
Neither the FCC literally means radio interference not random protocol clashes [0] like seems to be happening here. That rule basically means 'don't pollute the radio spectrum' and 'you have to accept the spectrum you receive'.
[0] https://www.reddit.com/r/ProgrammerHumor/comments/dy0p86/how...