IMO the best way would be for all OSS developers to come together and agree on a standard "OSS-like" license which is basically "OSS and free for everyone else except cloud hosters", if enough OSS developers do this it will force the major cloud vendors to implement a system to revenue share back to the creators of OSS their hosting.
I'm puzzled why Redis Labs, Elastic, Confluent and Mongo DB aren't already coming together to use the same standardized license as there's strength in numbers - instead they're each individually releasing their commercial efforts under their own individually branded license.
I think you are trying to mean not that. Like, if I install it myself, it's okay, but if the "cloud vendor" installs it for me, that violates the license?
I think I understand the sorts of entities you have in mind to allow or not allow; I'm not sure it's clear how you'd write a license like that.
"The cloud" is in the end just hardware somewhere else. I think you are maybe fantasizing about a license that would be more about _what sorts of businesses_ are allowed to use it, than it is about _how_ it's run. The OSI open source definition does not allow licenses that "restrict anyone from making use of the program in a specific field of endeavor. For example, it may not restrict the program from being used in a business, or from being used for genetic research." You could think that's an inappropriate restriction I guess. https://opensource.org/osd-annotated
It could also prohibit any commercial cloud hosting without written permission, for which it's automatically granted to every company that isn't Amazon, Microsoft or Alphabet.
At some point would it be collusion? I think collusion needs consumers, but the consumers of the cloud vendors would be harmed?
As with any standardization efforts this is just cooperation, there's nothing secretive, illegal or deceitful about it - they'd just be coming together to standardize on a License to build a sustainable business model that prevents cloud monopolies from using their OSS efforts to compete against them.