Sure, the Steve Wozniaks of the world have always had the ability to write their own GIMP plugins or whatever, and you're right: that hasn't changed.
But there were a few decades there where the rest of the world could actually own commercial software, and that had a lot of upsides. Those days are drawing to a close.
(Yes, I know that EULAs attempted to "license" software to you instead of truly letting you own the software. But for all practical purposes, you did at least own it to the extent that it would continue to work even if the software vendor's servers went down, or they decided they didn't like you using their software, or your government decided they didn't like you using the software vendor's software, or whatever.)