What is your problem with that? They don't request any unreasonable personal information/permissions, if I recall correctly they only use minimal info only: the unique user identifier (email address), and name.
They don't need to work with transactional emails, password resets, etc. Lots of failure modes and corner cases to support, for a minority. Lot of work and inconveniences saved for a free project that surely takes some effort to organize every year.
They don't need to work with transactional emails, password resets, etc. Lots of failure modes and corner cases to support, for a minority. Lot of work and inconveniences saved for a free project that surely takes some effort to organize every year.