Google through its browser, search engine, and Email monitors all activities of its users. Yeah, a decentralized search engine would provide more privacy to users and no censorship, information would be freely available to everyone and no centralized advertising. I was going through their wiki page, found couple of disadvantages.
1. There is no NAT traversal functionality built in.
2. As there is no central server and the YaCy network is open to anyone, malicious peers are (theoretically) able to insert inaccurate or commercially biased search results.
Users would consume a lot of bandwidth, how does a decentralized browser would keep up with this, donations?
Result verification is done client-side on every search, which increases network traffic on the computer running YaCy and makes YaCy slower
https://en.m.wikipedia.org/wiki/YaCyFrom a privacy and free information point of view, the concept of YaCy is really good. Decentralized search engine, decentralized browser, decentralized email service. Guess decentralisation could be applied to everything.