Yup, that is a major turn-off to using a new pseudo-social thing.

...the whole thing is so disingenuously presented in the patronising idea that people find it too complicated to have multiple log-ins...

Even more disappointing is that there are real, live humans who actually think this is so and that having everything tied together (the easier to be found and sold to, my dear) is no way threatening, insulting or demeaning.