(1) It is halal in itself to earn through providing lawful games in computer. But it is not suitable to adopt this method for income. Nowadays there are some games that are not lawful. Moreover computer games do not carry any physical or worldly benefits, rather they sometimes are harmful religiously. By adopting such sources of income sometimes one becomes cause of sins for others. Hence you should adopt any pure and halal method for income.
(2) The rent of internet wifi is halal.
Allah knows Best!
Darul Uloom Deoband