Questions posées lors d’un entretien d’embauche pour Back End Developer/Full Stack Developer chez Unity

Company (Helsinki) had open jobs advertised on Glassdoor but also other places and I was in the interview 2 years ago but I gave up, and I had contact of HR on Linkedin so I sent her message. I've sent my CV and got called after a week or so, I did short interview over the phone, and I was sent list of around ten tasks to do, out of which two were jsfiddle javascript tasks. I spent whole day finishing all the tasks and I've sent back results. I was promised to get answer until the end of the week but I didn't got anything. Finally I got call the week after that saying that I didn't had any bigger mistakes but that they will simply not hire me. They apologised saying that they hired some people and they will make a short break and that they will contact me when they open more positions. This was lamest excuse ever since I wasted whole day on the tasks and they didn't even want to call me in for the interview, but I said fine, ok, what can I do. I've also seen that they did put up new job ads but of course they never contacted me again.