On the world’s roads last year, there were over 20 million electric vehicles and 1.3 million commercial EVs such as buses, delivery vans, and trucks.
But these numbers of four or more wheel vehicles are wholly eclipsed by two- and three-wheelers. There were over 280 million electric mopeds, scooters, motorcycles, and three-wheelers on the road last year
There are about 20x more e-bikes than electric cars. Of course its going to demand more oil.
The real question is what is best in terms of oil demand between electric cars and e-bikes
I feel like all the points you raise could be replied by : if you do not like it, no one is forcing you into doing it.
It is my understanding that people do this for fun - to take the occasion to get into a new language and/or exercise their problem resolution skills.
Personally, although I love coding (it is a passion), after a whole day of coding I do not feel the energy to partake in a coding event. And during holidays I am busy doing other stuff. So I do not participate in the Advent of Code. But I am still glad that the event exists for people who enjoy it and have the time for it