In my opinion it is not about swearing, and (not) seeing it, it is about censorship. Some big sites censor content that contains words that are considered bad by advertisers, these are not only swear words but also words like die, suicide, porn… This has changed the way some people communicate, with people using euphemisms or censoring words in images themselves: people censoring themselves before the big internet site censors them.
As you wisely said: “Express yourself however you want”. The original author of the text in this post used a swear word and later it was censored by someone reposting it in social media to avoid upsetting the censorship machine or whatever website it was. I find this unacceptable.
I fully support using a rich vocabulary and not using swear words, being polite. There are many reasons to do this: respect for others, improving ones communication skills, practising formal writing… but giving in to censorship imposed by social media websites should NEVER be one. Fuck censorship. It is unacceptable to allow big tech companies to shape the way we speak with their censorship.
Express yourself however you want, if the website you’re in doesn’t allow you to do it don’t give in to censorship, give up that website and look for a place where you can express yourself.
That’s a good idea. Keep in mind that you can also install other OSs on a FairPhone: LineageOS, iodéOS, CalyxOS (unfortunately not GrapheneOS). A FairPhone can be a good hardware choice, and with it you still have the ability to choose an OS.