Thermostats are easy to change out. So this isn't a huge deal. But I don't love the idea that tech isn't built to be self-hosted or maintained in any meaningful way. If you're not shipping an open source version of your software when you close up, you're an asshole.
Yeah, self hosting isn't for most lay people if it's just a GitHub repo. But GitHub repos quickly become adopted by nerds like me who build tooling around it that eventually let lay people self host software with the click of a button.