So Facebook and Instagram do not let you see any page/profile even if they are public, without you logging in:
Now Twitter does the same (although they say it is "temporary"....like the special 3 day military operation in Ukraine. Ok):
And Reddit will basically not allow 3rd parties to access the content so you are stuck with the terrible Reddit website/app.
Now Youtube is cracking down on services like Invidious to make sure no one accesses Youtube unless they use the official website/app. And Nitter/Bibliogram/Teddit and the like, that were interfaces for the above ad networks, will probably either stop working or be a pain in the ass to keep them working.
Let's see how this evolves, but probably we will have to give up ytb.trom.tf, bird.trom.tf and rdt.trom.tf. And basically people should forget about Twitter and move to the fediverse. Forget about Reddit entirely and not even move anywhere else, do something else with their life. As for youtube the issue is that they completely own the video space, so moving to Peertube is never going to be an option in terms of finding videos to watch. So I highly recommend the amazing FreeTube https://freetubeapp.io/ - that runs locally and it seems to be a long term robust solution. It makes youtube a video platform and not an ad platform.
These companies do not provide social networks or video platforms, they may partially provide that but in truth they are ad networks. Like a Mall that has benches, fake palm trees and recreational areas. The Mall's main purpose is to sell you shit, not for you to go there and meet with your friends and relax. Therefore these companies will do all they can to restrict the content that OTHERS have created on their platforms, so that you "go to their Mall" to watch those ads, and for them to collect your data, and grab your currency.
It's all about that trade!