Some content blocked but not others?

Why am I not able to access certain US media content like NBC Peacock, or social media pages (Instagram) of most US news outlets, but I AM able to access most YOUTUBE channels of American news outlets? Is it the same case for Americans, eg. - is it true that they also cannot access certain Canadian media, but can for certain others? What is it that determines what type of media content is either available, or restricted, for people in different country to be able to watch?

Thank you for any input!

Content provider sometimes maintain a list of “known” VPN IPs they black list those. Switch servers and see if it changes.