Howdy! You bring up a few points, so I’ll try to respond to each of them. In the future it may be worth starting individual threads for each.
Can you elaborate on what requirements you have for GDPR, or the specifics you’re looking for?
Re: benchmarking, this documentation may be useful if you’re interested in doing some performance testing: https://apple.github.io/foundationdb/benchmarking.html.
Re: your question of use, Apple does use FoundationDB and the team is growing. If you or others are interested in joining the engineering team, you can reach out to foundationdb-jobs@apple.com.
Re: NodeJS, there’s a thread on the forums that you may wish to chime-in on.