We can count even the model in which a donation is not just a blank donation, but gives the donor the right to write something on the screen or something like that – these are actually not just donations, but purchases of these rights.
That's a fine point, doesn't contradict the value4value idea though, imho.
The problem is that selling digital stuff on a per-item basis is rather nonsensical, because the cost of reproduction is zero. Value4value is pay-what-you-want, and thus resolves this conundrum.
There are many other problems, and I wrote about them at length here.
In regards to static codes: I'd love to see them for dissidents and activists alone. Very different kind of "donation" if your life depends on it.
Since you posted a link to a very long thing I can't reply to this comment before reading it.
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