I’m hosting for over 15 years now and they have always been case sensitive. By far most servers run Linux version and linux is case sensitive. And Apache or nginx also.
You can indeed try to install some rules via .htaccess but that’s basically making redirections
This is not like emails that are indeed case insensitive
Edit : little nuancing after a quick research
When typing an Internet address, capitalization may be necessary. An Internet address is only case sensitive for everything after the [domain name] . For example, it does not matter if you use [uppercase] or [lowercase] with “computerhope.com,” it still reaches the same page. but anything after xyz.com like xyz.com/slow is not the same as xyz.com/SLOW