@LisPi back before we were public, the books were pretty transparent... that system ran on a small percentage of Roblox's infra.
We spent 100x the resources on the servers for hosting games. It was so cheap to operate, nobody noticed. I was the senior tech lead on the team, not once did anyone wave a bill in front of me or ask me to justify costs.
And all of this stuff is cheaper now because we have better GPUs for even less money.
You have a vision of cost, but I don't know where it comes from?