Any way to moderate new users to prevent spam?
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There is no single good way to prevent spam. It requires a lot of manual moderation eg. Facebook hires tens of thousands of moderators to perform content moderation.
If you are building a community, something you can do is to appoint community moderators, similar to how Reddit does it. These customer-users would be engaged to help moderate content -- you can grant them moderating powers as per our guide at https://getchamp.net/guides.
Another thing I am planning is a user point system.
The idea would be that users who are below a certain point cutoff could be prevented from posting, etc.
If you have any ideas, please submit a comment on this thread for consideration: https://getchamp.myshopify.com/community/champ/forums/7-support/topics/3580-planned-champ-features-last-updated-december-2018