That’s likely because Gimp stopped being good years ago and has a barely a fraction of the capabilities of photoshop. Not because it’s free. It’s basically photoshop circa 2012.
I say this as an Adobe hater. I moved my department off premiere and into resolve. I can’t stand Adobe.
It’s all about polish. That’s how AOL chat rooms lured the masses from BBS, and AIM replaced IRC as the mainstream messaging service back in the late 90s.