Yes, but not all clients expose dependent tasks (which is sadly a common issue with open standards: they aren’t always properly implemented). I’m using Tasks.org on my phone (which supports dependent tasks), synchronizing to a Nextcloud server with the Tasks app (which supports dependent tasks now, but didn’t for a long time), which also syncs to Thunderbird (which does not appear to show dependent tasks as dependents).

Edit: remembered that the Nextcloud Tasks app has long supported dependent tasks. I was thinking of recurring tasks, which it does not support. Again, open standards aren’t always fully implemented.

I think CalDAV (which uses the iCalendar format) may be the closest thing. It covers calendar items, obviously, but also task and journal items.

It sure feels like we’re at the peak of the Gartner hype cycle. If so, the bubble will pop, and we’ll end up with AI used where it actually works, not shoved into everything. In the long run, that pop could be a small blip in overall development, like the dot-com bust was to the growth of the internet, but it’s difficult to predict that while still in the middle of the hype cycle.

Relevant XKCD. Humans have always been able to lie. Having a single form of irrefutable proof is the historical exception, not the rule.

Technologically, I2P handles large data transfers much more efficiently than TOR. That makes I2P useful for torrenting large files like Linux ISOs.