Apple won’t be forced to change their current business practice if soldering everything to the logic board, security chips disabling devices after repairs unless unlocked with their proprietary software, etc, so it won’t affect their monopolizing of the Apple repair market. They’ll just have to offer logic boards for sale with a one pg PDF showing how to replace the board, and maybe they’ll make the security software fix more available (which would still be huge). But 99% of their users likely wouldn’t do it themselves anyway.
Either way, this is still a huge step in the right direction though!