Cryptocurrency, Visa/Master Card Gift Cards, "Free" Hosting (things like GitHub Pages), Free Cloud Storage Accounts....
There's probably ways to do it, but I wager they're not "simple" at all. All these companies usually are required by law to make sure they can trace their customers in one way or another (Know Your Customer) and are further incentivized to prevent anonymous usage because such usage is usually done by abusive actors who'll cause problems to the platform.
I'd be very curious to see someone who did it, write up the steps they took (that anyone else could take) to actually host anything online in a truly anonymous and _simple_ manner.
Know your customer is a banking law that banks have to follow for money laundering purposes
I'm not pretending to know every platform out there and every laws, but I think it's fair to say that accomplishing the things GP said is not simple, and that most service provider will need some form of ID somehow. Even ProtonMail will require you to make a payment or provide your phone number if you try to create an account from Tor.
Every step along the path of doing something anonymously online is difficult. There's nothing simple about it.