And it is in the best interests of FOSS to make it clear, time and time again, that the answer is no, and to work to ensure the answer is no.
Honestly it seems like the only downside there would be all the OSS purist/billionaire-defender HN commenters would have a field day, then you could move on.
I’d like to choose AWS to do this hosting in a lot of cases, assuming they’re willing. Barring them from hosting it is impinging on my freedom as a user and therefore with respect to whether I think that software is Free and Open.
That’s the exact freedom that Elastic is trying to remove here, for their own (totally valid) business reasons (they don’t want to compete head-to-head with AWS hosting), but in so doing, they’re removing an essential freedom from users. This is not about defending billionaires; it’s about having choice in the use of the software purporting to be free and open.
So it's a reduction in freedom, but it's not a reduction in user freedom.
“You have the freedom to contract for help with our software with this company but not that company” or “you have the freedom to contract for hosting in inefficient arrangements that we can beat in competition but not in efficient ways that we’d rather not compete against”.
Imagine just as an example, a license for personal software that is exactly the same as GPLv2 except billionaires can't use it. Functionally that has the same benefits as FOSS, even though it's not.