A good example is Facebook’s ReactJS. It’s a FOSS Web framework that’s currently dominating Web design. Just to give you a taste, the following sites use Facebook’s ReactJS to make their pages work:
Paypal, Venmo, Cloudflare, Dropbox, Protonmail, Private Internet Access, Reddit, Netflix and almost certainly your banking app… the list goes on.
It’s difficult to summarize just how much access Facebook’s ReactJS has to personal data but we’ll leave it at “extremely high”.
Facebook similar to Google plays a lot of tracking games with it’s users, but I still use Chromium based browsers, I have an Android-based phone and I use lots of Websites and apps that use ReactJS.
This card by Facebook exists in the same vein as those other projects, if there’s a problem it’ll be forked because any factory can make it and POSIX interfaces means anyone can write software for it. My guess is these’ll be available from 3rd parties in coming years, probably not from Facebook itself and it’d be contrary to their interests to meddle with it.