> I would not like to have business with such a payment provider.

Chances are that the decision-makers in most companies don't care about the technicalities (i.e. which email you used for registration) - they want to get up and running.

The reason that Viva doesn't care, I assume, is the reason Google workspace doesn't care: they're both too big to care for 5% of their clients won't do the extra work. They know that their, usually much smaller clients, will "figure it out" by i.e. using another setup that works™. So why bother?