I did not accept the gig, for the same reason as you wrote @english_voice :
I’ll not see my money if the result is not accomplished.
The GIG itself was about promoting patreon page, but I asked the seller, if she/he can guarantee X number of patrons?
And she/he said: yes.
I also asked her/him to state this objective in the offer details as well.
I didn’t know / didn’t want to know how she/he wants to achieve that result, but we agreed on those terms. It’s a fair agreement for me.
I can easily reject the delivery and ask for a refund, but I want more.
These kind of sellers needs to be removed, because their offer can’t be trusted. They offer something that they can’t achieve.