While low risk, I think index investing still counts as gambling. The house maybe too.

Depreciating investments like a car should be ok though.

She matched with you because she wants to fuck. Ask her out bruh.

Adding some element of democracy (like voting on posts) could maybe improve both those marketplace sites.

I think it would improve any site really. Imagine how much better Instagram or Facebook would be if one could downvote stupid shit and the posters would see what people actually thought about their posts/comments. But that might lead to sads, and therefore less active users, so they won’t allow it.

Democracy is pretty cool though imo.