Visionary accounts cost ~30 euro/month (assuming yearly subscription). That's currently more or less 30 USD/month and works out to 360 USD/year. Assuming those accounts get 60 years of use out of them that works out to 21600 USD in value/lost revenue. If you assume inflation of ~4% as a random number pulled out of my ass then that's 85k USD instead.
For 10 of those accounts that's 216k USD assuming no inflation and 850k USD assuming inflation.
So all in all that works out to closer to 360k USD in the naive case but more realistically it comes out to 1M USD flat with the inflation matched increase in service cost over that 60 year estimate.
Given this I don't think it's too terribly unfair to say that they are personally footing the bill. That's not to minimize the community's substantial contribution but the reward for this raffle realistically costs Proton as much to run long term as the raffle itself raises.