Plasma

Plasma is KDE's desktop environment. Simple by default, powerful when needed.

And, hear me out, you can just install and uninstall whatever you want.

Can you also install ads if you wanted to?

/s

Are you in the market for a plasma widget with ads? That can be arranged.
Add a drm module to it too to make sure it’s being built from the right sources and disable the whole thing if it gets a whiff of closed source