We have, but as mentioned by the author of this post, Matomo is more like Google Analytics. We want something simpler, with bigger focus on privacy.
Edit: Not advocating in favour of Matomo, it's just that it is a solution which seems quite full featured. Personally I found it painful enough to work with it (from a devops perspective) that I wouldn't touch it with a ten foot stick.
Way too many features that a person with a blog won’t need. Something simpler like Fathom or this one, which was built with privacy in mind from the get-go — instead of just “I want to get away from Google” —, seems like a better solution.
To be clear, I am not saying Matomo is a bad piece of software. Just that it does not feet our needs.