Good for them! I used to walk my dog past their (office? warehouse?) in Emeryville, and when the weather was warm they'd have the doors open and the giant server stacks just sitting there, looking awesome. I guess it's not really a concern that someone will steal something that looks like it'd take a forklift to move.
Honestly, not particularly. That area is really chill. It's literally across the street from Pixar's headquarters, and a block or so down from city hall. Utility outages are probably the biggest 'issue' in that neighborhood; we had power outages not infrequently, and this week they had their water main burst and shut down half the businesses nearby.
The ultimate aspirational homelab setup, ngl.