It literally didn't. Read about it and stop spreading misinformation. The deal is essentially like an investment. The developer still maintains full autonomy on the projects direction and leadership. All FUTO is doing is providing them stable income so they can work full time on developing the project.
It wasn't sold, it's being funded. There's a big difference. And the group behind the funding is a huge supporter of FOSS. They're gonna be "selling" immich licenses soon, but they're also going to keep all the source code open and available for anyone to download, modify, or use however they want.