$12256 / $11500
Resources such as this are good and all, great for freeware games and I can see it being a great help. If you're making a commercial product though it's very difficult to be 100% certain of the legal status of "free" content sites. In the least, you could at least use this to browse an artist's work and commission them based on it. Either way, it's a win-win. Depending on what your goals are just make sure you CYA.
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It is true many "free art" sites are difficult to verify. I'm not sure what you're looking to discuss, though. This seems like the middle of a conversation.
Opengameart is much better than most with regard to being fully legally useable; every submission is checked and verified for intellectual property conflicts. I would go so far as to say you can be more confident in the commercial availability of OGA assets than for assets on itch.io or the unity asset store.
--Medicine Storm