1]
You can disable the pop-ups in the settings if you have a paid version.

2]
avast is giving full protection, what extras you get depends on the version you have buy.
https://www.avast.com/compare-antivirus

3]
There is nothing hidden.
It was you own choice to install things like the “trial” for e.g. CleanUp.
You can choose what components to install (or not), during the installation if you choose for a custom installation.
If you did a default installation you agreed to install everything that avast has set as default options.
You can also add/remove components after installing.
https://www.avast.com/faq.php?article=AVKB96

Do yourself a favor and inform yourself before doing/buying anything next time.