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(+2)

If the game is paid and downladable only and you don't own it it's a sure thing you didn't play, for example.
Steam and IOS don't let people rate games they don't own. 

Steam and iOS are also walled gardens with strict DRM where the games have to tightly integrated into the platform to be accepted at all. And someone could own a game from elsewhere, or have downloaded a free copy from a key or promo. There's still no way to know for sure.

(1 edit) (+4)

Seems like my question is answered. The answer is: "Yes, you can". You just have to agree with it to post your game here, like the playstore.  Still feels bitter not being abble to answer a review even when people bash you just by looking at your game's screenshots, because they feel like (just like the playstore).