We all do for decades.I can assure you I'm not doing anything illegal... I just want to maintain my privacy and security since I do so much of my work and finances on my devices.
It takes much more than knowing which apps you use to do you any harm.
What you are implying is simply: I will not take my car to the dealers' for a scheduled maintenance because they will cut my brake lines and I will die. I know it from The Weekly World News.
However, you have no experience in maintaining a car, so you seek out bizarre solutions like: I know from The Weekly World News that the dealer will cut my brake lines while changing the oil, so anyone uses sunflower oil leftover from his French fries in his engine perhaps? Does pouring it over the roof suffice for an oil change?
It's paranoia. You have a comprehensive set of privacy settings in your MacOS, make use of them as you feel it, job done.