When I started my journey with Udemy, it was the payment methods point that became a hurdle. I feel this point is a hurdle in many countries. Paypal and Payoneer and that's it. Bank transfer is only for US citizens. It is a tough thing. In a few countries Paypal and Payoneer do not work and so a big number of people are deprived of participating on Udemy. 

Udemy is a global platform and global payment methods should be offered for both ends, i.e. for collecting earnings by instructors and for buying courses by students. 

Mobile payment methods are now an accepted phenomenon in almost all countries. People find it easy to pay and deal through mobile payment methods. If Udemy can offer these mobile payment methods countrywide, the number of users, students, and instructors can increase.