Now days internet places are very common and inexpensive, even in very remote little villages. Though they can't afford to sit there all day or everyday chatting with you.
So with that in mind, these are warning signs from my experience to cut them off immediately as you could be wasting your time with them.
- Always telling you no camera is available. At least one camera is available at those internet places
"It's too expensive to go to the internet place" I know of one girl who has no job, and still lives with her poor family, yet is still able to get online almost daily.
Shortly after getting to know them, tells you about <insert a relative here> needs some sort of medical treatment; an electronic device that needs repair (about $100); needs to attend a school but not enough money. You get the picture.
Also figure to be able go visit one within a year or less. If you cannot give them a commitment to go, they will be looking for someone else.
Things in the marriage department seem to move fast there. I knew a guy that did give a commitment, but by the time he got there, she had already married someone else..wow! But in the end he met another on the same trip and married her. I was very impressed with her.
Have fun