None of the articles should be behind a paywall. Researchers who have produced research want it to be read. These same researchers are also doing free labor and wasting tons of time editing and reformatting their own work. They also have to review the work of others, for free, for journals. These journals often then charge the authors thousands to publish said work. In turn, the articles are put behind a paywall so people can't even access them.

What percent of my disposable income (After needed expenses) should a young uni student set aside for fuzzies, versus just giving it all to utilons and only doing free fun stuff (e.g. public TV, only donated clothes etc)

Given the "likely to be under £500 a year" -- this is not intended as an opinion for all uni students.

I would still support de minimis effective giving for habit-forming reasons, among others.

What percent of my disposable income (After needed expenses) should a young uni student set aside for fuzzies, versus just giving it all to utilons and only doing free fun stuff (e.g. public TV, only donated clothes etc)

Not having any money aside for more than your bare necessities at university will curtail your capacity to experience some of the most important social sides of university. You will end up like an asocial hermit. If you want to think of it in terms of utility then I expect the possible connections and friends you can make by being able to be out more for 'fuzzies' can open up opportunities to make more later that outweigh <500 per year donated. But honestly, 500 per year is 10 per week to spend on yourself, which is almost nothing. Calling it fuzzies IMO underweights the value to you as a human of having these experiences, and you won't be able to have them in the same way after university. If by the end of the year or part way through you've found you haven't spent this money or spending money on such things to be pointless then you can always donate the rest, or back charge it in future years when you are making more.

I believe AI environmental damage is a key priority (compared to other environmentally damaging activities)

No expertise but my prior is not because of all industries that use electricity only a few can be amongst the most significant drivers of climate change. 

What percent of my disposable income (After needed expenses) should a young uni student set aside for fuzzies, versus just giving it all to utilons and only doing free fun stuff (e.g. public TV, only donated clothes etc)

Starting value (5% fun, 95% charity) open to change

I believe it is ethically acceptable to use AI art for non commercial purposes

Starting value- open to change

I believe it is ethical to use SciHub and similar sites in today's society

Starting value as a whole, open to change- I will admit I've not used it but I am 'fine' with others using it, but for myself I'm in a moral quandry

I believe AI deepfakes are causing significant near term damage

My starting value- very open to change

I believe AI environmental damage is a key priority (compared to other environmentally damaging activities)

This is my starting value, but very open to change