It's easy to dictate morals for others. How about let oss be voluntary and thank people for giving what they did in the past?
For better or for worse, the success of many large open source projects is driven by a community of evangelists that just wouldn't exist if the project weren't open source in the first place.
The longer it runs, the more this is true.
If that is the case, wouldn’t that right also apply to the primary maintainer/owner of the copyright or is it just the users that have that privilege?
If I were concerned about somebody eventually monetizing a product that I contributed to, I wouldn’t contribute to anything.