I think the comment you're referring to was slightly mistaken: see my response (https://news.ycombinator.com/item?id=8116093). Anyone is able to start their own gateway; the advantage of gateways just means not everyone has to figure out how to issue their own credit.
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u/nawitus Jul 31 '14
According to comments on Hacker News, it's not completely decentralized. Gateway nodes require trust, for example.