If you pay $5 and use $100 of bandwidth costs, you are in fact being subsidized by other users, not by margins. We don't know what OVH pays for bandwidth though.
What happens is roughly that:
- You are costing 1$ (bandwidth, etc.). You make OVH 4$. They are happy. Nobody offers you a cheaper alternative so you are stuck paying 5$ anyway.
- You are costing 4$ (bandwidth, etc.). You make OVH 1$. They are happy as marginal costs are low anyway.
- You are costing more than 5$. OVH severely rate limit your bandwidth to cut their costs and wait for you to leave because the service is now useless to you.
Personally I would say if Amazon makes a profit selling you a book and makes a loss shipping me some shoes which I return, the loss was paid by Amazon, not by you.