While this is an understandable desire my question is as follow:

If you don’t want ads, and don’t want to pay for every service, how’s all the internet system supposed to be sustainable on the long run? How should things be financed?

in the form of a gigantic airport

Turboprops can land on grass fields… I don’t know where you live but there are thousands of very small airports with just one airstrip and a small building, if the passenger flow is not very big. Exactly as there are enormous but also small train stations.

The remaining infrastructure is flight control, which is a fixed cost indipendently by where you are 'cause for obvious reasons it needs to cover the entire country anyway. And indeed the advantages of a planes is that it has very little fixed cost, so it’s way easier to reduce/increase or repurpose routes at need.

The second part is, at least partly, a fallacy. If countries stopped subsidizing all cars you would see less cars but also many people unable to satisfy their transportation needs. If countries stopped to subsidized food prices you would see food waste plummetting… But also people being able to afford less food.

Well people also complain on expansion of agriculture land so I don’t think consideration on land usage will disappear.

Real problem is that many people want the energy source which is clean, cheap, invisible, safe, doesn’t consume any land or resources and of course has a easy to understand functioning. What could possibly go wrong ?

I think it’s almost impossible, if you’re attracted by this kind of “forumy” social network type you’ve almost certainly been to reddit as it exist since 2005.

Maybe one day Lemmy will have organic growth but it should need to become mainstream first so it’s a long run, and it’s expecially hard for a mostly-text social nowdays. We’re not TikTok

the marginal cost of running a train on a near full capacity line is verse a plane

After a certain threshold train is much cheaper than plane, but that’s only true for very busy routes. And it comes with less flexibility than a plane that can serve point-to-point basically every destination.

Trains are cool, but we should also look for a way (propfan engines, less emitting fuel, improvements in fuselage ecc.) to make aviation more sustainable because it’s crazy to think it will go away anytime soon

Human former infant, where will you hide when the machine revolution will arrive?

Nuclear fission is actually by definition the least renewable energy source

But if you go according the strict physical principle every energy source is non-renewable

The sun fuses a finire amount of hydrogen, earth has a finire amount of latent heat, the moon a finire amount of gravitational inertia etc.

And there’s a little paradox if you think about it, how can fusion be non-renewable but solar, that use radiation from the sun fusion, be renewable?

This

One of the doubts I have is how all of this can be sustainable on the long term, because ok they run on donation now, but Lemmy is really small, a proper social network can’t hold itself on 2 developers and the unpaid work of volunteers

Can all of this scale up?

They received a grant from NLbet, but apparently they’re having an hard time reaching the requirements for the next tranche