Then yes, I'd say most people hold other industry leaders to a similar standard. The exact concept about open material doesn't really apply directly, but let's go with the broader "this has been an established business practice for years" concept since IMO that's what the bulk of the pushback to WotC was about.
Let's use Microsoft as an example. If they patched Windows 10 and 11 next month with a patch that removed all admin rights on your computer and only allowed you to install things on your PC through their app store, people would flip out despite the fact that people have largely accepted that model from Apple with their iOS devices. Why? Apple made their walled garden the standard from day 1 (and arguably a selling point because of some assumed baseline of security and quality), while Microsoft has years of established standard of allowing you to install whatever you like on your PC.
Edit: Look at the pushback Microsoft received when they announced the Xbox One and said your console had to remain connected to the internet and once you bought a game you couldn't trade it to a friend when you were done with it. Sony's guide to sharing used games with your friends was a pretty good marketing move.