https://lwn.net/2001/0301/a/rms-ov-license.php3
So it's not totally black and white, there's tactics and strategy involved. The less money going to Adobe, the less power and control they have. If they can force you to pay, they can force you to do other things. If they can't force you to pay, then they can't force other things as well.
Richard Stallman has nothing do do with open source, and Free software was defined as Richard Stallman's personal philosophy, take it or leave it. He hasn't changed it.
I'm a complete free software advocate, but definitely only for Stallman's reasons. I have no urge to give free things to computer programmers. If I'm going to give away free stuff, I'll give to the poor. I don't have any special sympathy towards the needy computer programmer just because they share my hobby/vocation.
Money was never the issue.