To your point, I did have a lender refuse to sign me up due to gmail account.

And just last week a term loan lender refused to sign me up for the following reasons:

"We will not be moving forward with a partnership at this time.
For your reference, the main criteria we look for in an ISO partner is the following:

1. ISO has been funding for at least 1 year
2. ISO has a strong online presence
3. ISO has overall positive, independently verifiable online reviews

(Hilariously, being I've been in the business 7 years....the rest is pretty self explanatory) Maybe they are looking for consumer visibility.