Usually it takes them weeks to respond and they come up with some crazy stuff like by business is paying for the trip and need to pay with a certified check outside the platform.

exactly I fund wholesalers in SC all the time.. its a boon to my business  :)  these laws are sweeping the nation.. its consumer protection U just have to many deals go wonky and complaints are filed so regulators are finally taking notice to this acitivty..

For us that more or less translates to using a tenant facing CRM platform.

Wholesaling can definitely be very time consuming, but it is possible!

While some agents have legitimate pocket listings (like selling between friends or family members), without a presence on major platforms, it's difficult to verify legitimacy.

DSCR loans are generally done in the name of the LLC (or whatever non-personal name entitle owns the property), so I'm not sure why you're being told they can't lend to the LLC, unless you're trying to get a traditional, consumer mortgage.

Start with $8K through FHA loans, joint ventures, private money loans, crowdfunding platforms, and BRRRR strategy.

are there any other platforms for such listing? 

I to believe that the new construction rental communities are a growing and very needed platform.  

Ark7 looks like a partnership platform.