I am not one of the downvoters, but in the specific case, the biggest thing for me is that most of your answer is just a fairly long list of links to external resources, and the rest is pretty much just paraphrasing one of them.
There's nothing inherently wrong with this approach, you're not in "not an answer" territory or anything, since it isn't ...
The question you have answered fringes on the borderline of the scope of Arqade. Some people think that the question is off-topic, as such they should be closed and not answered.
The downvotes you received are probably from users who vote on answers based on the question. They thought that the question was off-topic, and that you shouldn't have answered an ...
According to an answer from the Meta on Stack:
SE doesn't just cater to the folks who ask and answer. SE tries to
cater to those who have a similar problem and find a post via Google.
Not all non-SE users know what the number [votes] means. It seems obvious, but
it may not be. Especially for those not familiar with Reddit/etc. So,
fading it [the answer] out ...