Worse, the problem is that the metric for this feature won't ever be "customers asked us for a mail client and are now paying us for a mail client". Instead, it

Worse, the problem is that the metric for this feature won't ever be "customers asked us for a mail client and are now paying us for a mail client". Instead, it will be "engagement" aka wasted human time, from people who now have to endlessly press "not now" to dismiss popups for a feature they didn't ask for and have no need for.