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More co-operatively owned things is always good obv. But I'm not 100% sure of it. I don't think controlling the OpenID provider helps control what data the other site collects on you. If I use OpenID to log into a Stack Overflow site, SO can still collect lots of (personal) data on me.

Often OpenID login is useful as "you don't have to remember another password". Which can be good, but eh? I dunno?