It's not a right, no.
However, it being necessary, and an item easily monopolizable, I think it's reasonable that the government ought provide it for free.
As to native amaricans, I think a huge part of that is the strange setup of their territory.
Really ought just be properly annexed. Get rid of the beurocracy and legaleese putting a massive wrench in the issue of maintaining and improving their infrastructure, not to mention plenty else.
Also gets rid of the bothersome, and I think largely damaging, common trouble of casino developers exploiting them for the particular legal loopholes.