If the aim of the giveaway is to increase the channel’s reach and engagement, I’d make the entry requirements a little more strategic. Rather than simply subscribing, entrants could be required to subscribe to the channel and comment on a certain number of videos throughout the World Championship period. That not only drives engagement but also gives the YouTube algorithm a healthy nudge in the right direction.
As for the prize, I’d lean towards something that’s genuinely memorable rather than simply handing over a lump sum of cash. I see people have already suggested things like a Vegas trip or a round of golf. Rather than committing to a specific prize from the outset, you could position it as “An Experience with the Bandit”, subject to a maximum value of £X.
That gives you flexibility while creating something that feels unique and aspirational. For example, if it ended up being a Vegas trip, you could cover the travel and accommodation costs and perhaps even provide a reasonable gambling bankroll, with any profits split between you and the winner while you absorb any losses. To me, a prize that delivers a genuinely special experience is far more appealing, and far more memorable, than simply giving someone a cheque.