Cool idea though.
The scamming that happens to homebuyers is not even comparable to the risk in uploading docs to a website which promises they won't share user data with anyone. This is genuinely a pro buyer tool with no association with any 3rd party.
The tool has already helped many people negotiate and get a better deal on their mortgage. Please before judging understand that 70% of buyers overpay in their mortgage 1-3% in closing costs and bad rates. It's mind boggling how much lenders get away with profiting in junk fees from stressed out homebuyers.
What happens when you get hacked? Not if. To come back at someone with valid concerns with a "no, you don't understand my point of view" does nothing but a disservice to you.
Expecting people to just accept things is just not a good way to operate. When you receive push back, you need better responses than this. Will the vast majority of your users push back, sadly, probably not. However, you did post this to HN and then reacted poorly to valid criticism. Tsk tsk