Both sides do it. But difference is making a dev 1st party legitimizes it where as doing it with 3rd parties is controversial
The truth is that buying a dev to rob games off other platforms doesn't "legitimize" anything. It's even more shitty than timed exclusives. But console fanboys like to peddle that tale to make themselves feel better.
Literally any dev can develop games for multiple platforms, there is no such thing as a 1st party dev. There are only devs that have been forbidden to port their games to other platforms.
If you demand respect or gratitude for your volunteer work, you're doing volunteering wrong.