Getting work out on Kindle is pretty straight forward, anyone is able to upload their book files and make a start with self publishing. Of course, doing it the quick way means we won't have as much skill as needed to get the book right, and from my own experience and mistakes in the past, I would truly recommend some kind of training.
For everyday purposes, a massive library of affordable and worldwide contributed to selection of fiction and information is an excellent thing to have. We can enjoy what is on offer and discover many different tastes and talents from all over the world.
When it comes to more serious matters, and we need the information to be professionally accurate, or we want a book that we know has been edited and written to a high standard, a more discerning distributor might be what we need.
It is a known issue that Wikipedia is unsuitable for use in essays and academic referencing. Kindle is also in this league, it too is contributed to by anyone who wishes to. Liberty to create and distribute is a wonderful gift, however it does remain important to maintain an area of expertise that can be kept separate so that we know that we're going to sources that can be accepted by our peers. There are no guarantees for validity but the people who have the best information are the ones who have taken the time to study it in depth for themselves.