It's probably not availability issues. From what I've seen in Fossil discussions, sqlite.org is just a couple of Fossil instances (code and documentation) and a

It's probably not availability issues. From what I've seen in Fossil discussions, sqlite.org is just a couple of Fossil instances (code and documentation) and a pack of HTML pages behind a simple web server. They had to invent an ad-hoc scrape protection for computationally expensive requests, and probably have something like that for DoS protection. It is possible that it is not fair because of simplicity, and temporarily blocks certain amount of less lucky visitors. Intermittent inaccessibility of project websites seems regular to me.