I don‘t get what the actual problem is and how todays technology is limiting anyone to create something like a link-sharing (e.g. reddit) or link-redirect (hello url shorteners). Of course, if you need control over the content, then you have to build a content management platform, too (centralised or decentralised does not matter). But then you deal with boring copyright and other legal stuff.

And hey, browsers do allow extensions nowadays. And if that‘s not enough, build your own.