> Gimp is an awful app with terrible UX.
Yes, and it's not clear that those startups will fare better than gimp.
Adobe spends inordinate amount of effort to understand the problems that users are solving and make UX that users love. As the result Adobe has tons of money to improve the product. Users curse its business practices, white an occasional "goodbye Adobe" or "FU" messages but keep buying subscriptions.
The moat around this should not be underestimated. My 2c.