What is the ruling on entering an online general knowledge competition that requires a subscription fee of $30 to enter, offers escalating cash prizes up to $100,000, and allows for withdrawal and cashing out of winnings at certain stages?

Entering a competition and paying an entry fee is considered gambling, and participation in it is impermissible. The money paid may be lost without a return, or it may come back with an increase, which constitutes devouring people's wealth unjustly. For competitions to be permissible, their content must be beneficial, and there must be no entry fees or an increase in the cost of communication beyond the usual.