Solus also uses AppArmor (for example) that is developed by Cannonical and straingely, you don't complain about that while snaps - which is something that you don't have to install if you don't like it - seems to be a problem for you.
If you look at the 3rd party repository, you'll find things like Google Chrome, Skype, etc... These apps are there because there is a demand for them, just like snaps packages, people can decide to install them or not, this is also freedom, isn't it?
Personally I would be much more concerned by the snap packages themselves (i.e: some may eventually contain malwares) than from the snap store.
So you think they track everything you do... Have you checked your network traffic and found any evidence of that? Because here is what they say about it:
There is no “telemetry”. All the store gets from you is your ip address, a system-key, snapd’s user-agent, and for the refresh endpoint, the snaps you have installed. If you’ve logged in to snapd and the store (via snap login) it’ll also get a macaroon (like a session cookie).
If you set SNAPD_DEBUG=1 and SNAPD_DEBUG_HTTP=7 in snapd's environment you can see the body of requests sent to and received from the store, and inspect them.
There are alternatives to snaps: main repository, flatpaks, appimages, building software from source...
Regarding Solus itself, it doesn't collect any data and has no intention doing it. And nope, Solus developers never heard about Canonical, it's not like some of their developers do contribute to the linux kernel, gnome or closer to Solus on projects like Budgie or the Brisk menu only to mention a few example. 😉