This isn't really true. You also have to buy equipment and run specialized software to participate in PoS. It requires keeping a node connected to the internet

This isn't really true. You also have to buy equipment and run specialized software to participate in PoS. It requires keeping a node connected to the internet with high uptime, and maintaining its software and hardware. Plus, due to slashing, you are uniquely responsible for mistakes your validator makes. So, staking comes with both responsibilities and consequences for breaching them, just like any legal contract. The fact that you can rent a turnkey cloud solution to do all this work for you and split the profits isn't really relevant to the argument IMO (I consider staking with Coinbase "renting cloud computing" in a specialized way).