Most of the bloatware comes from Google itself: on my Samsung Phone I have Google Chrome, multiple Google Play stores, Google Keep, Google Photos (sends your photos to the Google cloud), Google Drive, Google office apps, etc. I've never wanted all those apps, I don't even have a Google account...
What's worse is I have an Android phone still that has Google+ and guess what, it's not going anywhere.
(Only ... slighly ... joking.)