I think the main issue is the liquidity problem. Decentralized exchanges are lacking liquidity usually.

Hi Vadim,

But how does the swap happens? Where do the source the tokens from and how?

That's a good question, I've been wondering the same. I think from how I understand their project, Totle puts together existing solutions into a set of tools. Part of that is the Swap function which helps you to swap tokens at the best price available compared to other exchanges...