It's speculation, you may or may not get anything for this donation. In past, several projects rewarded to Gitcoin donors, although this is not Gitcoin but there is possibility that you could be rewarded for your donation, it's not same as buying the token at all.
So the job is just to donate? then the reward is their token. What if someone makes a larger donation, is the reward commensurate with what they spend? This is a rare and strange method and you need to be careful because you have to spend money to get rewards
Yes, your job is to donate 1 USD, as I said it's speculation they may reward donators with their token or they may not, please bear in mind while donating that your donation could go in vain and you may get nothing.