Prebid PG is open source, so anyone can spin up the 4 different types of servers needed to offer a PG service.
See Adding a PG Bidder for the high level view of the components.
As a PG Host Company, you will have expenses in running and maintaining a global high-performance cluster of servers and databases. You’ll need at least one PG Bidder, which might be one you build on your own or partner with someone else. You’re under no obligation to support other PG Bidders, but your publishers may request it.
For now, the only information about building and running the servers is in the relevant GitHub repos:
Prebid does not offer specific guidance about fault-tolerant architectures. It’s left up to each Host Company to determine what will happen if one of the servers goes down. i.e. Will there be load-balancing, automatic failover, a warm stand-by, or no fault tolerance?
There are a fair number of moving parts in a Prebid PG installation. Prebid.org does not run a test cluster. Changes are made by Prebid member companies, which do have test clusters, but they may not test every possible configuration. e.g. different databases, geographic lookup vendors,
We recommend that PG Host Companies commit to regular testing of software updates against their specific configuration.
The testing of PG Bidders and their pacing algorithms may be important to you, as publishers and advertisers care about the delivery patterns of their ad campaigns in a variety of challenging scenarios. Prebid.org may have extended recommendations about PG Bidder testing in the future, but in the meantime, you should consider joining Prebid.org and chatting with the development teams involved.
When ready to open their doors for business, Prebid.org members can ask to have their contact info added to the list of PG Managed Services.