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.