In every way. Any Google service can fail for a myriad of reasons, from internet connection problems to some random failure of one of billion fantastic engineering pieces involved, to Google blocking your account for whatever reason, to Google deprecating the service.
Compare this with failure modes for the date(1) utility, or a Casio watch, or the default one in your phone.
It might be more illustrative to use some more complicated service. Compared with VLC, reliability of YouTube is a joke.
Compare this with failure modes for the date(1) utility, or a Casio watch, or the default one in your phone.
It might be more illustrative to use some more complicated service. Compared with VLC, reliability of YouTube is a joke.