In this context, you are implying the platform is the browser? Assuming you produce your own content and own the domain for which these URLs are being produced then, yes you are left to trust the clients that actually render the content.
> In this context, you are implying the platform is the browser?
No, the platform is wherever you distribute the URLs to other people. Browsers, for the most part, don't share URLs with eachother without an intermediary server hosting the shared links, either as one or more traditional webpages with links or something like a shared bookmark list.
Storing the page in the URL doesn’t remove the need to have a platform to communicate those links to those who want them.