Or that an online bookseller would try to rent out compute.

"Depending on how you want to think about it, it was funny or inevitable or symbolic that the robotic takeover did not start at MIT, NASA, Microsoft or Ford. It started at a Burger-G restaurant ..."

https://marshallbrain.com/manna1

Well, the first commercial computer was created by a company whose primary business was running cafes... https://en.wikipedia.org/wiki/LEO_(computer)

You're thinking like a startup founder where you should only focus on innovating your main product. FB is a mature company where some vertical integration can make sense.

They literally print money; smart move for them to make this investment imo.