I get where you're coming from. The problem with a lot of alternatives is that they're just worse. Analytics alternatives are a prime example. I'd very much like to self-host my analytics but the alternatives pale in comparison to the features offered by Google Analytics. Automated bot filtering, realtime statistics (how many people are on the site right now), not to mention the power user features and integration with Adwords and Search Console. Maybe one day this will change but for now, especially if you're in the ecommerce space, you don't want to go with a worse alternative to such a critical aspect of your business.

My biggest issue with GA at this point is only that so many visitors block it. That's the biggest reason why I'd want a self-hosted solution. At some point, even with all of its great features, GA will simply become useless.

I mean, I’ve replaced Photoshop with Krita for my personal use. It’s not like everyone who pays for Photoshop actually needs all of the professional features that sets it apart from FOSS alternatives.