Honestly gamers have been stomaching this for decades with Steam so Sony wants in on some of that sweet sweet action as well.
And pirating stuff off Steam is generally extremely trivial, so it's a largely coercion-free business-customer relationship, and I think that's a large part of why they're doing so well. People like to support businesses that treat them well. And for those that don't? Well I think there's a reason that video game piracy is plummeting, while film/media/streaming piracy is surging.
It's not a used game market unless you can transfer it to other people an unlimited number of times without the original company getting a say.
If something costs $10 "normally" and is $1 with a "discount of 90%" you can just as easily say it costs $1 "normally" with the $10 being 10 times "normal". It's purely arbitrary which one you label as the normal price.
I don't think thats comparable at all. You're not buying used games, you're buying discounted games. Sony can discount games too. Steam doesn't have a secondary market either.
We just seem to trust Valve more to not rugpull our purchases.
Killing the secondary market for games hasten how soon they can sell $100 games.