Oh my gosh I loved Diaryland, and how you could customize your shit with some simple HTML, but I think they went through enshittification while they were still around anyway

But..what says something like Diaryland can't be brought back now?

Did they? I think it was LiveJournal that enshittified. Diaryland is actually still around. I just checked it out and it now "Diaryland v2!" I actually last checked it out in the past year and it still looked exactly like it did back then!