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Hey, I'm the author of the linked post. More than happy to answer questions...

"FluidDB is an openly writable shared database." The flexibility, REST and query language look cool.

Can I install FluidDB for myself and use it for projects? Or is it more meant to be a centralized db of stuff that you guys run?

It's meant to be the latter (centralized) but there is nothing to stop you from using it in your own projects. :-)