Believe it or not, modding is extremely easy nowadays (compared to when I first started in Beta 1.8.1), and there are plenty of packs outside FTB and Tekkit.
Modpacks are built for the not-so-tech-savvy (Which is definitely not the majority. For example, I would put the number of people playing their own packs on the FTB forum as around 60%.) and the lazy people.
Mod distribution in law is a grey, controversial area. However, it is always a mark of respect (which any community needs) to ask for permission before adding it to the modpack. For example, if your neighbour doesn't want you to crawl over to his lawn and dig holes, but it is not explicitly allowed or disallowed by law, would you still crawl over to his lawn and dig holes?