That's why it's really good to have a good running product first before offer a partnership to anyone
Nobody would ever get anywhere if it was done like this. It's more like, going into partnerships that are well risky but knowing about the risk, knowing that it's likely the project will not pan out and being prepared for it.
So for instance, it makes sense to ask what you will get out of it if the project fails and there is just no money? Sometimes what was built can be reused for another project, or there can be an email list that can be reused and so on.
Instead I see people (like in marketing and such) trying to lock up an ICO project into a multi-year contract (lol).
Just learn to deal with risk man..