Unlike PayPal though, you can't just close your account and hop to stripe instead. Once you develop a game you're stuck with that engine until you redevelop the game. Moving engines is not easy simple or fast.
It's like if I owned an old version of Photoshop and Adobe contacted me to say that because the jpg I produced blew up on Twitter I owe them $1000. I can't retroactively take the picture down and recreate it in gimp and I shouldn't have to. Most alternative products to unity simply do a hand wave to old products. "If your game was made in engine 2.0 you have this pricing structure, but engine 3.0 users have a different one"
It's like if I owned an old version of Photoshop and Adobe contacted me to say that because the jpg I produced blew up on Twitter I owe them $1000. I can't retroactively take the picture down and recreate it in gimp and I shouldn't have to. Most alternative products to unity simply do a hand wave to old products. "If your game was made in engine 2.0 you have this pricing structure, but engine 3.0 users have a different one"