... and that's it in a nutshell - those who know about things can remove the DRM. It doesn't affect piracy.
Like with movies you buy that don't let you skip the adverts or the anti-pirating warnings (doh. pirate versions don't show those), it's the legitimate paying customers that suffer.
Treat your customer as a criminal, and don't expect them to respect you.
It's not always the fault of the companies themselves. Subscribe to Netflx? Enjoy your collection of "The (US) office"?
Well, tough, that is going soon. Netflix has lost the rights. We're not even talking new shows, but the back catalogue wil no longer be available, as studios are now opening their own streaming services.
Their greed will stop the legal streaming models successes over piracy. Who's going to subscribe to netflix/amazon/bbc-box/disney+/nbc/sky just to get all the programs? https://www.wired.com/story/netflix-the-office-streaming-wars/
The whole model is a house of cards, and not technically, but due to the short-sighted greed of the big media companies still stuck in the past.
I remember some web site pointing out that (paraphrased) "originally, singers and musicians used to make their modest living performing. It's only due to the invention of recording devices that the silly money came in - and only then because the recording process was so expensive. Those of them wanting to go back to the old times should realise that technology has simply caught up to create a more level playing field"
Nope, I'll never buy anything with some sort of call-back drm on it. If I'm paying money, I expect it to last as long as I want it to.