I'm not sure I understand the use case. You're offering file hosting on a $5 DO box (which may get upgraded). That would probably be too unreliable for most professional cases, and also it's not a CDN. However, AWS and others offer real CDNs, and at an extremely low cost. Why wouldn't I just use CloudFront if I wanted to host a file that isn't on any CDN? No disrespect intended - I may have misunderstood the purpose.