Sorry for the delay, had to spend some time looking into bitboost so I can respond properly. From what I gathered, bitboost is a dApp that allows for decentralized buying and selling in online marketplaces, and the privacy feature is great.

However, spl.yt differs in two key ways:

First, its providing the protocol layer for market places to build on. So any existing market place can build upon spl.yt and access smart contracts to decentralize the current process

Second, and I think bitboost attempted this but seems like they executed differently - all market participants now benefit from the decentralizing existing online 3rd party facilitators - i.e users can now make money from identifying fraud or reviewing/rating their experience. A 3rd party is no longer needed to facilitate these behaviors - this also decreases listing and selling fees (this is where all eCommerce blockchain projects are similar).

Hit me with more questions!