Ah just FYI the donation part is no longer relevant, the referral is entirely based on the tracker url, see e.g. https://steemit.com/byteball/@punqtured/referral-links-are-king
But yes this drop was a cool initiative and I definitely think it serves its purpose of exposure.
The referral is entirely based on the tracker but you still need to make the 600,000 byte transfer to acredit the new person. I think.
Last time I did it, it didn't have the option to transfer, it only was a sign process. Hmm...