The only one was Cloudflare on another project (file hosting) - and being fair, we did do 20tb of transfer in a single month on the free tier, which they weren't so pleased about :P. that really crippled the website and we struggled to run the service after that point (oddly enough, going from their CDN and network to our own which could barely squeeze past 1gbps wasn't ideal).

It's more the longer term potential - businesses change, or see valuable partners and may decide to react accordingly, I guess having many CDNs is the best approach and swapping them out on the fly.

I do have other concerns, mainly about the pricing and how you plan to deal with things like hotlinking, taking a .m3u8 is super easy to abuse. You charge $780 for 416 days worth of streaming or in easier terms $1/12 hours of streaming so I wonder whether you will let people impose limits or what happens once those limits are reached.

I could easily take someone elses m3u8 and let them run up the charges on your service whilst I get the wonderful video hosting for myself.

I especially liked this part:

"Please do not upload video, download the playable assets, and then delete video."

You might as well offer that as a service since there's not really much you can do to prevent people using you as a transcode service directly (well, you can, but do you want to?)