I work at Improbable. Not an official comment, but we're an independent company and Google has no investment in us, though we do have a partnership with them, like we do with other companies like Tencent Cloud. We do support large MMOs, but our networking can handle lots of game types so we have a range of hosting methods - public cloud, bare metal, hybrid. AFAIK, the pricing for SpatialOS is comparable with other managed services for multiplayer - there are examples on our site. And we don't just do networking, we do co-dev, managed hosting, server orchestration, consulting, etc, etc. I guess go read our website if you want to know more?