Comment Paranoid? (Score 5, Informative) 186
Here's an idea. If you are uncomfortable with Google and such, eyeing them as a big brother of some sorts and do not want any Google Play Services or anything Google touching the device... you should return that tablet. Buy a Nexus 9, or a used Nexus 10 or Nexus 7 (2013). This may look counter intuitive, however Nexus devices have pretty much some of the strongest following and modding community behind them and since Google releases the full source for these devices, they are the first to get AOSP variant roms such as CyanogenMod, SlimROM, and Paranoid Android. Once you get them, you can easily follow guides on XDA Developers ( http://www.xda-developers.com/ ) to Unlock the bootloader (Via Google released ADB/Fastboot tools), install a custom recovery (I recommend TWRP which is open source as well so you know what you're getting). Then, depending on your level of paranoid, you can sync the AOSP tree from Google itself and build the entire ROM from scratch yourself, or build or download a flashable zip file of any custom ROM such as CyanogenMod, SlimROM, Paranoid Android etc, and then load it onto the device. AOSP based roms such as these DO NOT have Google's Proprietary API's and Google Play Services. Straight Android. Plus, will full open source, you know what's in it. You will still have to deal with the proprietary blobs left in for display, modem, wifi, etc, however it's as close to full control as you can get for Android with a 100% fully functional Android device.