Abuse of this sort of functionality is definitely something I've thought about, but discussions around these sorts of ecosystem issues weren't my focus in this work. Ultimately, there are solutions. For starters, you almost certainly don't want every link or comment from any user to show up automatically for everyone the instant it is made. There's a fantastic comment by user 'enkiv2' over on lobste.rs about this (relating to design decisions around Xanadu) that also roughly reflects the kinds of assumptions that I've been making in my prototyping about how this might work in practice: https://lobste.rs/s/p0sgoj/freeing_web_from_browser#c_vivphl