In my opinion, $6,600/mo in hosting fees is insane. However, I do not have specific stats on bandwidth and whatnot Voat goes through. I think it would be advantageous to do a colocation instead of cloud based hosting.
Colocation, as opposed to cloud hosting, is where you host your own, pre-purchased hardware in a datacenter. After the initial hardware investment, you pay for rack space, electricity, bandwidth, and (optionally) a level of support.
I'd bet it's way cheaper.
Stay away from big names -- Microsoft, AWS, etc. Much less likely to get censored by governments in places like Netherlands etc if you pick a location like that.
Doesn't scale as well as cloud (i.e. if Voat instantly became 100x more popular overnight, would likely need to fallback to cloud.)
Need to see the DDoS protection/etc from each provider.
Initial investment -- hardware (eBay is cheap!), setup fees.
Possible support fees, but can be avoided if there is a sysadmin within driving distance.
More specific stats on Voat usage; affects backend CPU utilization, bandwidth throughput and monthly bandwidth consumption.
Personally I have never had a project large enough to consider moving to colocation, however I do believe it would be worth trying.
Here is an example of a colocation service with plans: