Not sure what to elaborate on, so I will just explain more in depth what I meant.

So, because Sync is a closed-source app, in order to modify it you will need to change the compiled code itself or to add your own code, hoping it doesn't affect the application.

no-ads and less talking to 3rd party version of sync. what I meant by this was that the modders would change 2 things : Ads and requests sent to 3rd parties (google, amazon, facebook, etc.). I have no clue how apk/android modding works, but I'm assuming all they have to do is remove the sections that add ads and talk to amazon, google, facebook etc with data.

Make sense? If not, let me know what doesn't and I'll try to explain it.