After a bit of looking they don't seem to publicly disclose exactly where their physical servers are located. It looks like they have their own ASN, which means they're serious about not depending on third party infrastructure more than necessary. They have a Tweet here that says where their datacenter ISN'T located, but not where it IS located.

https://ipinfo.io/AS399647 https://mobile.twitter.com/rumblevideo/status/1574938103885996033

They were founded in Canada, which is concerning, since Canada has much more stringent speech laws. But it looks like they recently opened a location of SOME kind in Florida, maybe for exactly for that reason.

They went public recently though, which isn't a good sign for keeping any kind of principles.