There should really be more courses for German speakers. I noticed that German only has 3 courses; English, French, and Spanish. I don't think a Dutch for German course would be too hard to make, as they are very similar. I hope that in 2018, the incubator adds Polish for German and Dutch for German.
Swahili, Norwegian, Hebrew, Swedish, and Danish don't have any courses, not even ones that teach English. Another hope for 2018 is that these languages eventually get a course for themselves.
Finally, I hope that every language on Duolingo soon has an English course, a Spanish course, and a French course soon enough. It will take a while, but it will be rewarding.
well I think that courses with English should have a priority and courses that don't involve English are just "a bonus" (except when it's a regional language like Catalan)
Swahili, Norwegian, Hebrew, Swedish, and Danish don't have any courses, not even ones that teach English
it's because those people (except Hebrew maybe) speak English anyway so the courses aren't viewed as necessary, you could also say that there's no English for Irish or Esperanto speakers
I see no particular reason for favouring English over other languages. Arabic, Chinese and Japanese should get lots of attention also, for example, as should Russian. All of these are quite relevant for large populations.
the majority of its users are in the U.S.
The U.S. likely constitutes the single largest group, but I wouldn't suspect it's a majority. After all, English for Spanish speakers is the biggest course by a long shot, and English is the most commonly-studied language by I think an even longer shot.
The internet is quite global, aside from some exceptions such as the Chinese and soon the Russian internet.
Of the 1.4 billion plus Chinese speakers on the planet, only about half a million have seen fit to embark on the Spanish course aimed at them. This would necessarily dampen my hopes of seeing many Chinese-based courses launching in the near future.
except Hebrew maybe
Actually, most people in Israel speak English, I'm pretty sure. Last time I was in Israel, I didn't have to use Hebrew once (which is good, since my Hebrew is pretty terrible). Granted, I was only in Tel Aviv and Jerusalem, so I don't know about more rural areas, but if you stay in the big cities you might not need to know Hebrew.
True. Esperanto and Irish are what you would call languages to learn for fun. Swahili and Hebrew are spoken in countries that also speak English (Israel, Kenya, and Tanzania), so maybe not as much them.