[Samsung Galaxy Tab S3 Questions & Answers] JackieBlue:
I want to add that most any app can be uninstalled on the Tab S3 once the disabling of Samsung, Google Play Services and Google Play is achieved. Prior to this, for whatever reason I had a great deal of difficulty uninstalling Chrome and Google Play Music. If you think really, really hard in advance about all of the paid apps that you want that are critical to your root and whatever other paid apps you want, you can install them and ditch Google Play Services. They got their money and earned what they deserved. There is no reason to keep Google services continuously running in the background. You can get top notch apps that don't depend on them. I have My Backup Pro, Servicely, SD Maid, an APK extractor, a couple of really good disablers/uninstallers, ES File Explorer, Root Explorer, etc. Really consider your privacy - your data is important. Would you let a stranger rifle through drawers at your house? Even if Google has been collecting your data for years, all hope is not lost. You have many years ahead of you. Most of the data they have collected becomes obsolete over time and they don't need to keep collecting it. There are many, many apps that are not dependent on Google Play Services. There's an app called F-Droid that has an .apk installation file that can be directly downloaded from the Internet and which offers LOTS of great apps. They have an app called Yalp Store that shows you which apps Google Play Store offers that don't depend on Google Play Services and you can filter those results. You can even download and install them manually. The developers of F-Droid are privacy-conscious and all of the apps that they offer are geared with that in mind.

I paid a lot of money for my devices - what, $1300 overall? The manufacturers are not entitled to more than that, especially if I have paid for additional apps. I do have a dummy YouTube account - I consider it free cloud storage for my videos in exchange for the the data they have stolen from me over the years (I've got some cool videos, too - I'd link to my channel but it would blow my cover).

To achieve all of this you will need to start fresh - uninstall your apps, remove your SD card, clean your device really well, wipe your device and close your Samsung account. You don't need a Samsung account to run your device. You can decline both Samsung and Google services at setup but all of those choices are meaningless because they take what they want anyway.

There may be a few sacrifices that may be a dealbreaker to some such as Facebook, but there are a few apps that work around that limitation such as Tinfoil for Facebook. You may also be able to log into Facebook using a privacy web browser. I have Firefox on my devices using a VPN, Privacy Browsing and multiple privacy plugins and it works just fine for every website I have visited (I can't speak for Facebook, though, because I don't use it (not for privacy reasons, though - I have unresolved mixed feelings about it). It should be fine to use with a web browser although some websites do badger you to use their app. You can try it though before uninstalling the Facebook app and see how it goes. Granted it won't be as convenient but you can bookmark it and still have access. Twitter is dependent on Google Play. As I was writing this paragraph I just found a highly rated app called Metal for Facebook & Twitter which isn't dependent on Google and which allows you to access both of them. No ads, gets you notifications from Facebook, supports Orbot/Tor, etc. Sounds excellent.

So there's some stuff to consider.