Almost every new car uses libcurl. You can find curl in TVs, gaming consoles, smart watches, smart phones and so on.
Also smart phones, smart watches and TVs generally don't use libcurl for that. Android, iOS and WebOS have their own HTTP stacks. I don't know about cars or consoles.
Nearly every videogame for instance use libcurl as their HTTP stack. You know why? Because it's the best HTTP library for C/C++.
If you have a C/C++ application doing HTTP traffic it's likely using cURL. Or, I dunno, you could look at this page to find out: https://curl.se/docs/companies.html