that's a gross mischaracterization of the situation.
copyright doesn't mean "i get paid", it means "i get to withhold" (see all the out-of-print books, abandonware, etc).
GPL does not mean "you have to contribute back your changes" at all: "The GPL does not require you to release your modified version, or any part of it. You are free to make modifications and use them privately, without ever releasing them." https://www.gnu.org/licenses/gpl-faq.en.html#GPLRequireSourc...
one is about taking access away (for whatever goal), the other is about taking that option away (for the benefit of users).
copyright doesn't mean "i get paid", it means "i get to withhold" (see all the out-of-print books, abandonware, etc).
GPL does not mean "you have to contribute back your changes" at all: "The GPL does not require you to release your modified version, or any part of it. You are free to make modifications and use them privately, without ever releasing them." https://www.gnu.org/licenses/gpl-faq.en.html#GPLRequireSourc...
one is about taking access away (for whatever goal), the other is about taking that option away (for the benefit of users).