The difference is in the cases you mention these are massive companies with plenty of money simply trying to protect their revenue streams, whereas here we're talking about open source maintainers that are often doing this for the sake of their love for the project and the users, and getting very little other than recognition or ability to influence the project in return. It's not like you're talking about making a billionaire make a million less than he otherwise would.
Moreover, often these folks have rare expertise in those subjects, and/or rare willingness to work on them as open side projects. If you tell them this is just something they have to deal with, I wouldn't be surprised if you also remove some of the incentives folks have to keep contributing to OSS voluntarily in the first place. Very little money, and massive risk of losing control, recognition, etc. even if you "succeed"... how many people are still going to bother? And then you get shocked, shocked that OSS is losing to proprietary software and dying.
The primary benefit of FOSS over proprietary software is, in fact, the ability and willingness to change things and open up changes to a wider pool of developers. Fiefdoms are actively hostile to open source principles. Obviously it's good to treat people with respect but you shouldn't let worse code win out just because of ego alone. Sometimes software gets forked or rewritten and sometimes the fork/rewrite wins out, that's evolution and competition and it keeps the ecosystem healthy.