But there is virtually nothing for a fix and flip type borrower or a BRRR method borrower.  

Everytime I try to explain my methods to her, she doesn't understand at all what I'm talking about.

Others employ a BRRRR method or do wholesale deals/flips to have cash to invest long term. 

Could it be interpreted that way, arguably yes.But if you're going to challenge a law's constitutionality, the reference I provided is perhaps the most common method.

Only thing is other than personal finance, what other methods are there for funding, buy, rehab, rent out and hold type deals.

I require all new tenants to use it, but I have a few that use other methods due to them being tenants when I acquired the properties.Background and credit checks are easy to send to an applicant - they pay 55.00 and I get the reports quickly. 

Consider that on many SFH with the BRRRR method you rent and hope to get a few hundred a month free and clear.

This took away the LL capability to not renew lease or, my preferred method, provide large rent increase above market to get rid of less than ideal tenants.  

A lot of mistakes can be made if you do not talk to the right people and use preventive maintenance to avoid problems.Multifamily rentals are a great way to use the more doors more cash flow method.

Any online method i can ask tenant to use that can deposit the amount to my bank account which is free for tenants and safe method for me to use. i had issue with one of the check send by tenants (not a tenant fault)and i was about to fall into scam as i tried to deposit the check online but now want to stay away from Checks. venmo/zelle doesn't allow bigger amount transfer.