Well, yeah, you didn't legally establish any liability, or even, apparently, make even the suggestion of the intent to do so.
Insurance companies, being for-profit entities, aren't in the business of giving out gifts.
> Now, if I had comprehensive coverage, they'd be facing my insurance company
Yes, dealing with other driver's insurance companies (along with uninsured drivers) is among the more significant reasons to carry more than liability coverage.
> The whole thing is a scam.
I don't see a scam anywhere.