$5k also doesn't sound like a whole lot of money to give a guarantee about the security of your FOSS code. Unless I were already rather confident about it, it would take work for me to convince myself about it to the extent that I would be willing to answer a hundred questions on someone else's form. $5k isn't necessarily that much of a compensation for that kind of work, unless you're also gaining something from the work itself (e.g. from reviewing the security of your code for its own sake).

I don't know if filling and returning these kinds of forms can have any kinds of legal implications, but if it did, even potentially, there's no way I'd do that for $5k unless I were in absolutely dire need of that money.