I don't use analytics on any of my services simply because I don't like analytics and people tracking me, so why would I do it to others?
Does it mean I don't track my business metrics? No. I still measure general conversion rates from sign up to payers. I measure things like sign ups per-month. You don't need analytics to track that. Basic metrics combined with a "CHANGELOG" file with dates/releases/fixes is plenty for my solo business. Want to know what I did in January to spike sign ups or more payers? Look at my change log.