$50 per day is a unit-economics target, not a definition of getting rich. Before building anything, estimate storage plus replication cost per active TB, outbound bandwidth/CDN, upload and download traffic, support and abuse workload, payment fees, and fraud losses. Then compare that with realistic revenue per 1,000 legitimate downloads or views.
A small invite-only beta is safer than launching an affiliate program immediately. Measure storage growth, egress per active file, advertiser fill rate, deletion/abuse rate, and the percentage of earnings lost to fraudulent traffic. If the model only works with aggressive pop-ups or unlicensed popular files, it is not a stable business.
You also need a clear takedown process, repeat-infringer policy, suitable jurisdiction and legal advice, and payment/advertising partners that explicitly accept file-hosting risk. If you bring in a partner, define ownership, infrastructure costs, compliance responsibility, and payout rules in writing before either person invests money.