To me, TIL is just a phrase and not a "thing" that you actively seek out. I don't doubt that some people do this, people do everything imaginable, but on the list of problems I'd like to have, this rant seems quite high up.
I like "TIL"s for quick references. HashRocket's TIL page[1], for example, often comes up in my searches. I don't know if it counts as a TIL in the way OP means...
The author is in a bubble.
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You took the very words right out of my mouth.
Jokes aside, TILs are not necessarily just junk food. As a reader, oftentimes I find them akin to hors d'oeuvres that whet my appetite for something other than what I'm diving into at that period, a sort of inspiration.
Sure, many of them may turn out to be low effort blog fodder, but that usually has to do with each individual source's quality - in which case they help filter out low SNR sources.
Of course, when I have TIL-style moments myself, I jot down a quick note, usually ending up fleshing it out later, as I expect many other engineers do. I prefer having a low effort aide memoire for later, rather than an open browser tab or bookmark that I'll almost certainly forget about in a few hours' or a day's time.