Currently, the only way to earn $FCL is to get rewarded for the daily data minting activity. There are 2.5 Million $FCL in monthly rewards. This gets equally divided between all the Mainnet users. The maximum amount of reward per person is, however, capped at 500 $FCL per month. Thus, if there are fewer than 5000 users, you will get 500 $FCL — if there are more you will get less.