And for the bad applications you can use FilterBox (paid app), that allows you to regex them and automate them in different ways.

I tend to use "Focus Mode" turned on always in Android. Most apps are short lived (5 min after being opened manually), this reduces a lot of the spam. I automate extending this time using the same FilterBox to auto click the notification that the app will close in a minute, but only if the screen is turned on. So the app gets automatically disabled when I stop using the phone.