> "...a hobby website using GA is too minor to care about for any of the privacy reasons the author states..."
while it's a whole lot less signal per site, long-tail websites can provide more signal per visit than large ones. knowing you like kazakh folk music more uniquely identifies you for targeting than knowing you read cnn.
and for small sites, you don't often need a lot of data. just knowing number of visits and some basic visitor characteristics (country, time, etc.) on a per-page basis is usually as much as you need to make use of. depending on the business, a large site can and possibly should build custom analytics as a competitive advantage that doesn't have google (and facebook, amazon, etc.) looking over their shoulder.
nobody really needs GA. many don't even need realitme analytics afforded by a js library loaded on every page. you can just do log analysis, à la the original urchin analytics that google bought long ago.