First you could sue all the singers who have lip synced in a live performance and see how it goes.
I'm reminded of the https://en.wikipedia.org/wiki/Milli_Vanilli fiasco: nobody sued, but revealing they were lip syncing killed their career.
alt Hacker News
I'm reminded of the https://en.wikipedia.org/wiki/Milli_Vanilli fiasco: nobody sued, but revealing they were lip syncing killed their career.