imo they offer unfinished or straight up redundant products. with the "community feedback" you get a certain amount of "points" which you can use to beg them to implement features (which other apps implemented years ago) only for them to basically never implement anything, even if hundreds of users describe it as "critical".
it took me a week to convince my family of a familyplan, but then less than 1 hour of trying the android apps to decide against it.
never in all those many many years. imo the main benefit is disabling mails from the corp u give it and only enable when needed, so i blocked thousands of unwanted mails.
and with addy.io all gets pgp encrypted, which is another major benefit.