Almost all claims are made in that discord channel. A claim is an active task that must be made in order to receive the rewards. There are two other ways to receive rewards in the form of citizens besides the discord Claim. One is by delegation of 500 HP to dcityrewards, and this is a Young Citizen passively distributed daily without need for daily interaction. The other is by ownership Claim from the Luxury Street, Communal Housing and Migration Center combines which mint a single student each for 800 SIM - 400 SIM every 1-2 weeks. I think someone has a Luxury Street listed right now for 350k SIM in the marketplace.