I bought a Dell fall a year ago with Windows 8.1. Now, I have the option of converting to Win 10 at no expense & had signed up to do it, but then started reading about all the privacy issues. I use Classic Shell to make Win 8.1 look like 7 (which is what my old laptop was on before it crashed) & I've gotten used to it. I decided I wasn't going to 10 & cancelled out. Evidently, you can disable a lot of the Win 10 features that affect privacy, but it's not an easy thing to do and not all in one place. Here's the article that changed my mind about going to 10:
Everything You Need to Disable in Windows 10