There can be issues with your earning methods as having a low cap for the entire campaign would only lead greedy people to create more. There should be rules as well. But in fact, if a project like this that would implement the same forum and earn system as the others, it would be hard for starters to gain popularity with content that is way unique amongst the others. I've seen and tried tons of forums that lets users earn and non of them lasted long than this forum. Why? because of having a hard time getting quality posters that wouldnt create tons of alt.

Also, if the platform was created with PHP, how can you sure that this is entirely secured and cannot be hacked? I've seen an article recently that hackers manage to create backdoor on PHP repository - https://securityboulevard.com/2021/03/php-repository-exploited-by-hackers/