I have good experience using Nicehash, also all the countries you listed above are available on nicehash as well, I don't understand what you are pointing at here, you are only correct about the shares rejected, that must be because of location or weak internet connections like you said
I pointed here exactly what I posted, I'm unsatisfied with Nicehash
Nicehash still show on the program all the servers, but only two are showing online on their status, take a look, I don't know if it's a problem or they removed another servers:
You can check by yourself:
https://status.nicehash.com/When I was mining with the location of Sao Paulo, the nearest of my location, I was receiving a lot of invalid shares, at least 3% in the last days, but now look at my ratio on Flexpool:
And now pools are paying better than Nicehash
I always defended Nicehash here, but now there's pools paying more, and more stable, maybe in a couple of days I'll get back, but not for now, they are facing a lot of issues, it's the 3rd day of problems