Well connectivity (speed) and energy stability may be 2 of them (your internet may go down along with electricity).

Or look at it another way: you wanted to buy/rent a server you intended to put in datacenter anyway. Now you can do the same with laptop.

Jokes on you I got a 20kWh backup UPS on the entire house.

Now on a serious note: internet can go down anywhere, even for them. There is nowhere stated that, if your old hardware misbehaves, you can use others, and there are privacy concerns with running your stuff on their software stack… So I don’t see a huge advantage honestly.