First, when you get into these arguments, always start from the viewpoint that these people do not see any worth in their data. Their convenience is worth way more than any privacy breach. That’s why your goal is usually to convince them that privacy breaches can be a huge innconvenience for them, use their selfishness to advocate for their self-interest.
Quick example, what defines something that needs to be hidden changes constantly with different governments and regulatory bodies. There’s no telling if your current data won’t be illegal or something in the future, causing you problems. That’s why it’s important to have protections for your data to begin with so a future government can’t just unilaterally decide to trample all over your rights.
Basically, see what they care about and try advocating from that viewpoint, not your personal viewpoint. There’s a good chance you’ll have a line of argument.
I find that I have more success convincing people if I put their self-interest first and foremost instead of trying to explain some grand ideology. People want something tangible, not a hazy ideal. It’s only when something affects them that they may change their views.
It’s not really Twitch’s fault. Twitch doesn’t care about sexual content, they’re a company they don’t have morals. They’d be more than happy to rake in those dollars. The problem are advertisers and payment processors who have very strict views/policies on stuff like this and Twitch has to kowtow to them if they want to be in business.
So many sites have this happen to them, where they allow or even encourage sexual expression and then a payment processor comes in and says “yeah if you don’t cut out that we’re dropping you” and then it’s over.