I have always been curious about this. Did you get them to use other services or did they stubbornly refuse and you just accepted it? I am talking using Chrome, using Windows, using social media like Tiktok or Facebook or Instagram, etc. Bonus points if you have kids because that is even more work in the privacy realm
I've also discussed with my partner that they're welcome to use Facebook but I strongly object to putting photos of children on there until they're old enough to make their own decisions.
I've pointed out that posting publicly is purely for vanity reasons unless they've made a conscious decision to have exclusively friends and family. In other words, you don't need to please people who don't matter.