If it was on any other board I'd say report to moderators. "Comment this page" sounds like soliciting low-effort spam, which is against the rules.
But it might be ok in games & rounds and if the organizers of the giveaway want to piss their money away by giving it to cheaters - that's their problem.
That's true that's their problem bit rolling a giveaway like that, to make it hard for cheaters they should do a KYC, I'm sure the manager is fully aware of those abuses, because of the so many brand new accounts posting, they should at least set the requirement to a member account, to avoid this kind of abuse.