It doesn’t really need a W-8 form, it need some info that Kong enters into an electronic version of the W-8 form for the USA tax authorities.
Kong thinks it has to do this (or send the IRS 30% of your share) legally*….simplest way is just to give them the info they need.
The only dodgy bit is that Kongs form has a ‘US tax ID’ slot, and won’t accept leaving it blank even though for many nations citizens it’s supposed to be optional (don’t know about Canada). You can try to get Canadian tax advice on whether the tax ID is optional, and then try to get Kong & the IRS to talk to each other and accept without if it isn’t…….but it’s probably far simpler just to fill in the form.
*because the servers are in the usa I assume……it’s a legal grey area, but Kong’d rather play it safe and not piss off the taxman.