It wasn’t always a Meta product. Also, by the time everyone started finding out how evil Facebook was, Whatsapp was too entrenched for people to easily switch to something else, not when all their friends and family members were using it.
In a lot of places, SMS is/was more expensive (and Whatsapp seen as affordable/available) around the time Whatsapp took off. If you’re from somewhere like a relatively small EU country where you’re more likely to want to message people from other countries, there’s also the issue of international rates. So SMS had more disadvantages in some places and wasn’t necessarily as widely adopted as in the US. And some places didn’t have quite the same progression from dumb phone texting to smartphone texting that the US had, either because of costs or lacking infrastructure. More people skipped the widespread dumb phone texting phase, and internet access was expanding. So there was no reason not to use a cheaper internet-based service from a provider people didn’t think was evil at the time.
I’m older but have the same sense you have. I think your best bet is to choose a career to pursue based on the kind of contribution you’d like to make to the world.
Right now, AI is mostly changing the way some jobs are done. Other new tech will probably contribute to more of those kinds of changes. If you choose a career primarily based a skillset you like using, I think there’s a good chance you’ll end up very disappointed later when the way the jobs are done changes. But if you choose based on impact and then develop a range of skills (especially people skills!), you’re more likely to end up OK.
You mentioned that programming and urban development interested you. Urban development seems more directly about making a certain kind of impact, so in your shoes, I’d go that direction. That said, I don’t know why you’re interested in programming, and maybe there’s an impact you want to make in that field too.
I made the mistake of choosing a career based on a skillset. New technology has reduced jobs in my field, but the much larger problem is that I hate the way the jobs are done now. I could probably stay motivated and do the extra shit needed to survive in that career in the longer term if I still felt like it made a positive impact on society, but the field itself doesn’t make the world better. So I made a shift into a new industry, although I’m not expecting stability from this one either, and it’s not one that would make sense for you based on your post.