It's not any form of lock-in or anti-competitiveness, and it's not an aspect that's specific to Steam. You actually need to substantiate that instead of just claiming it. Almost all the online digital platforms do this, even non-gaming ones, and it's weird that it's only being argued here because it's about Steam.
This is a digital media rights issue, not a Steam issue.
This is a digital media rights issue, not a Steam issue.