Reminds me of that Black Mirror episode. Spoiler: things go very badly if it's forced upon you.
This is, afterall, what the majority of adblock and anti-tracking proponents have been lobbying for. 'We don't want to have to deal with ads. We don't want to be tracked. We want to pay for content.' This simply gives them the opportunity. Note that it is also voluntary and doesn't prevent the content from being displayed. Heck, it says "would you consider" and has a suggested bitcoin donation equivalent to 1 penny.
Not to mention the contribution to rising income inequality/decreasing social mobility. If all useful information is behind a paywall, only those that can afford it will have access - further increasing the return to capital.
All this to say, be careful what you wish for...
In particular, I'm thinking of:
Wikipedia
Also, maybe it will lead people to start putting trust in offline archives of information, which wouldn't be terrible either.
Honestly, a lot of the "content" on the internet is garbage/not productive. I can at the very least argue that lots of bandwidth that's being used on the internet is just watching shit that's usually not educational.
I don't think the fact that wikipedia produces it's own content is relevant, and whether it lacks curation being relevant either. Regardless of those two facts, it is immensely useful. The majority of articles, especially on highly technical/useful topics (like farming techniques) are mostly accurate.
Just because some may not be in a position to buy/afford something doesn't mean that everyone should endure inefficiency. Also, depending on the price, the truly important information would still be worth it. I don't think what's going to keep the less fortunate from using web services is a reasonably priced web service.
Currently, you can get a VPS for roughly $10/month, and a domain name for something like $70 (a .com usually costs this much I think). If you had monthly subscribers who were asked to pay $1 a month, the amount of subscribers to keep you in business (nevermind that today's tech can easily scale up to thousands of users on one box), is not high at all.
More importantly: just because I look at something doesn't mean I should have to pay for it. You can't know if an article is crap until after you read it. That's the nature of dealing in information -- you can't sell information without first giving people something valuable for free and building trust. If you violate your customer's trust, you can no longer sell information.
That's the state of internet advertising today.
The problem is that there is no way to easily give a small amount of money to a content creator on its creations.