Helldivers 2 received over 14,000 negative reviews today due to an update that will require PSN accounts next week.

nanoUFO@sh.itjust.worksmod to Games@sh.itjust.works – 579 points –
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So how does Steam tell their own users’ usernames apart if they’re mostly duplicates? Something smells like bullshit.

I assume they're talking about player names, not usernames - steam usernames are unique, but steam player names can be whatever you want and are often duplicates.

Except for the fact that there are ways to differentiate accounts uniquely, like SteamID. Games have access to it, obviously. Hell, even external websites do, like trading bots. You log in through steam and they know who they need to trade with.