Many of the websites I read do not collect any appreciable amount of money from ads, or have no ads at all (one example: news.ycombinator.com :) ). They want a recognition, or to share the knowledge, or community, or they are building their brand... And AI is destroying this all - the first result of "zx80" is an AI overview with a link to wikipedia and some youtube videos. If person stops there , they will never get to computinghistory.org.uk link, and won't see any related information about the variants and models.