It's awful that in today's world, a feature of a platform is that they don't partake in a particular scummy business practice. It's a shame that we even have this issue.
Blame the "no regulation" crowd for that. Well functioning regulation and consumer protection is what promotes good things by forcing bad actors to get in line.
In theory, a competitive market could achieve the same goals, but in practice, it seems like marketplaces often need some regulatory nudging to get over the humps.
Every time we say "in theory a competitive market could achieve the same goals," we find that the entrepeneurs don't have the same goals. The problem isn't the mechanism of capitalism, it's the naive belief that consumer goals and seller goals are aligned.
Actually the problem is more that the theoretical concept of a competitive market bears about as much resemblance to any real consumer goods market as a homogenous sphere of bone, meat and skin in a frictionless vacuum bears to a cow.