When you want absolutely zero responsability, you get what you deserve. You become a puppet.
Like we all do for almost everything else. No?
I take no responsibility in writing to someone or sending them a package. I am become a puppet to the shipping companies/Royal Mail.
I take no responsibility for my internet connection to the internet, I buy that from someone else.
I take no responsibility for the power that runs my office. I buy it off a wire. It's someone else's problem.**
You can continue this list for every and when you get into modern business it increases an order of magnitude again.
If all companies did their own thing there would be millions of different produces of the same 'service', it's not efficient. it would not be efficient or cost effective for an IT company to generate their own electricity and pay salaries to all the engineers required to maintain it. It is easier if a small selection of specialist companies focus on delivering power and the IT company pays them money to do it.
Moving infra into managed data-centres is just an extension to that.
The real caveat here and what people who rely on AWS/Azure et. al. will discover, the cloud provided leaves the configuration totally up to the customer. If you didn't configure and pay for a fail over with storage in different regions, then tough. Not our problem.
If you 100% need that power for critical ops, banks, hospitals etc. Then you provide a generator. Well, you lease a generator and maintainence contract with a generator supplier.
If you set up your "house of cards" anywhere. Be it on-prem, off-prem, co-located or cloud it's still going to fall over if you have no resilience designed into it.
** Not really in my case, at least 60% of it IS generated by me and MY responsibility.