Would it be possible to use a cloud server instead of dedicated server for running high speed Action MMO?

I believe so, though I don't think it's much different, a cloud service such as azure or amazon EC basically gives you a stack of VM's to deploy, its also pretty pricey. IIRC Azure for 10k dual core instances would be like 2.5ish mil a month.

I was thinking about a monthly rental with midphase, or cheapname. I can get cheapname a month for $20.00. But it's only for limited resources. But for my project it might be just enough.

You can also use something like NodeJS and web-sockets if your multiplayer needs are not too big. There is a demo on the Godot repository with some examples. It may be cheaper to host, depending on the pricing (I haven’t really looked into it myself).

3 years later

Stumbled upon your old thread and wanted to chime in. Yes, using a cloud server for high speed Action MMO games is totally doable. Lots of game developers and companies are already using cloud servers for this purpose. I know 7 days to die A21 should work on a cloud server if the server meets the game's system requirements. You might wanna check out different cloud server providers and their prices to find the best fit for your budget.