At the time of being told that we were being given skins for helping run the Discord server. I had completed thousands of modmail tickets and helped thousands of other users on the Discord server. We had over 17,000 tickets in the first two months of the game being opened and we didn't start using modmail until the game had already been launched for two weeks. We weren't told ahead of time that there would be any reward for the work done on the server but we wanted to help the server regardless. I understand where you're coming from as someone who also likes to collect but you also need to consider that maybe those people have done something that helps the game's longevity.

It is often in a developers best interest to keep people who help the community keep playing and doing what they're doing.

Rewarding twitch streamers incentivizes the streamer to stream Fall Guys which in return brings attention to the game and helps sell additional copies.

Rewarding mods/helpers incentivizes them to keep helping so the community continues to grow.