Grow lamps?

For stuff like servers or mining rigs, it would probably be more efficient to have a few high amp outlets feeding power strips in racks.

Maybe they were just sick of the socket always being a tiny bit too far away to charge their phone while using it and went all in.

Yes. The layout of the lighting indicates that the room was used for some project rather than a regular living room.

Maybe they had a lot of fish tanks. Each tank takes at least 3 sockets. With water involved, it's also makes sense to have wall sockets instead of using extension cords on the floor.

Sound or streaming studio?