Lexiiii
You're right but just because it's not optimal doesn't mean it's not also the future... The fact that they allow people to skirt KYC and AML in a very clever wallet to wallet way without any intermediary holding funds means it's only a matter of time until enough people have gotten burned that they will be looking for alternatives...
Such exchanges just naturally complement the actual function of cryptocurrency in the whole decentralized peer-to-peer aspect originally outlined in the btc white paper. Sure, there are lots of people who still don't understand cryptocurrency, and who just want to buy from a big exchange because they like the idea of diversifying some of their assets.
Ultimately though, the people who drive real markets are the peer-to-peer grassroots economy... Yahoo can try to make a market but I think unless they have some huge unannounced plan, I can't see it really doing much