a) That does not equate to "parts most popularly used" in those hobbyists' projects. One may well have a stack of 7805s in one's inventory, and then go for a low-drop or switching alternative in a project. Or put a uC in nearly any project, but have 20 different types of those.

b) As anyone who's ever been to a meeting of electronics enthousiasts, radio amateurs, hackerspace etc knows: parts inventories age. In some collections a good % of parts is decades old.

Many parts are just to have something on hand when one feels like experimenting / designing something. But 1st experiments & published designs can be like baby strollers vs. SUVs.

Besides: nothing wrong with many of the 'ancients'. 1N4148 has good specs for a small-signal diode. The 555 is, and will remain a classic. Exact specs of an opamp don't matter much in many circuits, as long as it's "good enough". Etc etc.

I guess more precise definitions of "popular" could be constructed, but that's the simplest one and I went with it, especially as it isn't particularly invasive or creepy (we're just counting how many people have a certain linked part in their database, think of it as a counter per linked part that gets incremented if somebody adds a part and decremented if they delete the part).