Well, here's a different view. This turn of events is just capitalists doing capitalism.
Discovery built up its own music library, so they could save money and not have to shell out for unique, individualized music for their shows?
It's a low blow to strip out the original, royalties required music, and replace it with stock library music.
Its also pretty much the "vertical integration" from Rockefeller 101.
The same capitalist system that required, for a while, that composers actually be paid. For a while. And then, apparently, shed like extra baggage jettisoned off a ship.
Will the Discovery-watching public, in their dwindling numbers, ever organize angry boycotts because the bumper theme they heard in Cash Cab is noticed as identical to the ending credits of Battlebots: Resurrection ?
for interesting reference, here's a link to all the show's the discovery channel is making. I gotta say, most of them look pretty awesome: https://go.discovery.com/tv-shows
And as show music goes, a lot of the stuff I've heard on these shows us quite good indeed! I know that these composers have been counting on the royalties, in some cases, for their retirement income. So this latest development sucks for sure. Too bad music is so contractually ephemeral.