If you actively try to avoid software that is licensed under BSD or ISC, only Gnu's Marxist license, then that means you won't use OpenSSH or the security tools ported over from OpenBSD into both Linux and Android and will not use an operating system or programs that have been compiled with LLVM/Clang.
I prioritize system security, and for that I only care about open source and reject free/libre software due to all of its built-in political implications. But also defend the right for people to make proprietary software. I won't use it, but defend people's right to make it.
People must give up how they want the world to operate and deal with what is. For example, FSF is wholly incompatible with BSD and the 2 distinct cultures and views can never work together. They are both open source, but that's where the commonality ends.
Pay for an online number, there's one time phone number websites you can use, but services are getting better at detecting if it's a real cell number and block VoIP numbers.
It's good to be leary to give your number to a business or service for privacy, but there's no valid reason to obsess about individuals getting you number on a social level, you're not important enough for other individuals to start bothering you simply because they got your number. I have a business card I give out with my personal number. However it also means you can't use plain texting because other apps on the the other person's device will see from your text message that this is a live number to track and spam.