The idea that altruism isn’t simply rare but completely non-existent is simply…incorrect.
Here we have hit on the issue. People can be, and are to a surprising degree altruistic. It is not a normal form of operation though because it isn’t guaranteed, and out certainly isn’t the norm for how we all interact with each other. There are homeless shelters, food banks, soup kitchens, and this sort of thing help the most disadvantaged, but those provide services until they run out of space or materials and that’s it. The ones that run on donations and that are funded by angel donors are indeed altruistic.
By and large though, services provided by society to its members are not handled that way. Social security has its flaws, but it’s not altruistic because the first seniors got it for free: they were lucky. It’s entirely transactional because everyone is obliged to pay a portion of their income into the pool. For countries with free education it’s the same thing: everybody pays in so students can go at little or no cost.
And here is the rub and the original point: educators don’t and SHOULDNT be expected to work for free. Leaving aside the facilities and support staff that also needs paid at a university, it would be unconscionable to expect to go for free and just let those people figure out how to eat. Scholarships are another form of altruism which is loosely relevant, but generally speaking I think what you are considering non transactional situations to actually be those that have been collectively paid by our taxes. Socialized, if you will :).
Make no mistake though, we are all expected to put money in if possible, and then we all benefit at the end.
I guess I didn’t know what outcome(s) you would like or expect?
I think “we should provide education free of charge (paid by taxes)” is great and would be beneficial at all levels.
Contrarily, I think “I should get free education and not have to pay for it or provide any effort at reciprocity” sounds and feels super entitled and shitty. It sounds exceptional, and like the libertarian examples before to me.