The meme does not confuse Sync with Foss apps, it points out that Foss is the rule here rather then an exception and Sync stands out among the others like a sore thumb.
So its a very bad example to how things are run here.
Now a good argument against this meme i have seen is that you shouldn’t compare a Foss app with a non Foss app, oranges vs apples. But personalty i think all software should be Foss by principle (and many seem to agree here), so I am comparing software that is build using an ethical model vs software that is not.
I have nothing against having the option to donate, which has worked for many projects.
The idea you are sketching, it is a possible reality but that is the bad future to me.
There’s a threshold where the number of users makes it impossible for your service to still have any real sense of identity or intend and it ought to be broken up in smaller parts. Some of the larger instances have already passed that threshold in my opinion.
You did mention the solution, “The alternative is possible small scale” The good future is where every family has their own private instance and every business and service has their own public one, interconnected.
Keep things small, manageable, focused and responsible.
I do agree this (fediverse) likely won’t last, not with so many predators waiting to grab a piece. Web3 is not here yet, as much as meta threads want to believe we are it.