I would say based on personal observation that the more scrape-worthy an app is, the more likely it has cert pinning. Rather obvious if you think about it, really. High value targets especially from big shops tend to have other measures like complex MACs that make scraping hell.
I’m sure most largely-worthless-to-scrape apps don’t employ cert pinning.
Recent example I encountered: TikTok web API has dynamically generated parameters X-Bogus, msToken and _signature (could be slightly wrong, it’s been a while) that are verified server-side. I haven’t reversed their mobile app so not sure if they also employ MACs there, but I’ve seen these from other apps in the past. And it’s harder when employed in an app; on the web you’ll be reversing (obfuscated) JavaScript in a readily available debugger, whereas for an app you’ll likely be reversing from disassembly.
I’m sure most largely-worthless-to-scrape apps don’t employ cert pinning.