I would go with the ikoula offer for sure.
That Ryzen 3900x should be good for 12x 64 @ 64 ticks with mods.
Seeing as it's in someone's datacenter, I'm guessing it will run a local database for settings etc?
I would recommend it if your databases and webservice etc etc is on another server elsewhere, but I really can't recommend an all-in-one solution. 🙈
Check out the hetzner auctions for a cheaper alternative maybe, and pick up a secondary cheaper box that's all storage, then you'll have both their DDoS protection and better ways of metagating attacks and downtimes by spreading things out.
game/exchange:
https://www.hetzner.com/sb?hdd_from=...40000&ssd=true
web/exchange:
https://www.hetzner.com/sb?hdd_from=...0000&ssd=false
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