For me personally, this is a great idea - anything that can expose these leeches is welcome on the forum. It would be even better if you had more data, say IP addresses, considering that most of these "geniuses" probably use the same IP addresses for all their accounts.
If the possibility of blocking by IP addresses ever appears, the forum will lose a third of its users. Not everyone knows how to separate multi-accounts by different IP addresses; there will always be errors, and it will be quite expensive for these farmers to buy a separate IP address for each account. If we remember the times of bounty, then farmers registered more than a hundred accounts, and all this could have been prevented by not allowing registrations from one IP address.
Edit: I am not against registering alternative accounts, but a sense of proportion, that is, having three accounts per IP, is more than enough to not violate freedom of speech and democracy, which is often the basis for allowing alts.