Not to be overly pedantic, but tweets can contain links, including links that go directly to the fundraising call. The compact visual design for tweets make the URL and call to action very explicit and obvious. And people can choose to retweet/quote-tweet the tweet-with-a-fundraising-link for further emphasis.
For example, here's the thread author quote-tweeting the beginning of his thread, which allows him to prepend both a tl;dr and a link to "archive.org/donate"
If he wrote a blog post that includes the fundraising URL (e.g. at the top and the bottom) and tweeted a link to that blog post, you believe that that call to action would be more visible and obvious to the average reader?
For example, here's the thread author quote-tweeting the beginning of his thread, which allows him to prepend both a tl;dr and a link to "archive.org/donate"
https://twitter.com/textfiles/status/1204431184069058560
If he wrote a blog post that includes the fundraising URL (e.g. at the top and the bottom) and tweeted a link to that blog post, you believe that that call to action would be more visible and obvious to the average reader?