By default, snapd keeps three copies of older versions of a snap package. It does so, so that you can revert easily to a previous version if the latest version does not work. You can disable this feature by setting the appropriate key to `1`.

There is a negative sentiment around snap packages. Even if you are an experienced Linux user, you fall into that negative sentiment and even if an issue is small, it is a deal-breaker for you.

The "chromium" issue has been explained in 2019. Ubuntu 20.04 does not plan to package "chromium" as a deb package (too difficult to maintain properly), therefore there was a need for a backup plan if users were trying to install it.