Based on the era when RHCP was the most popular, I would guess that PE people buying the RHCP catalog plan to license it to advertisers for just about everything as Gen-X people age into the 60+ demographic and retirement. You can expect to see RHCP music in adult diaper and "help I've fallen and I can't get up" commercials in the future.
Only if the talent pool was restricted or if they also hold the distribution keys. Unfortunately, anyone can buy a $300 guitar and become a master, given time and commitment. This can then be used to influence AI into cleaning up your sloppy playing and off-tempo. Possibly even creating entirely new sounds from it (midi?) and then anyone can create a signature sound and model a band or music group around that motif.