I pay a very small fee for debrid and VPN servers that offer exactly the same server capacity with enormous bandwidth and virtually no downtime.
Did you just compare your small private server with YouTube’s infrastructure? Jesus Christ.
Google had already been paying about 2 million a month for bandwidth in 2015 or so.
I work for a larger company as a software developer, even with a billion in gross sales, there is absolutely no chance to provide even a tenth of YouTube’s service. Especially for free (without paywalls). The company would go bust in two years.
VPN has absolutely nothing to do with hosting a video platform, no clue why you even bring it up.
Debrids is just a file download service, isn’t it? But even if it was a video hosting platform, a single server would never be enough. You need at least two (as a fall back). Then you need dynamic scaling for bigger user numbers, which works just fine for CPU and RAM (or even GPU resources), but doesn’t work for storage. So you need extra storage somewhere all servers have access to, but when it comes to videos you’d be paying millions in no time.
So you need your own cheap storage and datacenters around the world. And CDNs on top to serve your content worldwide (otherwise the experience would suck on another continent if your server is too far away).
Look up how Google does it, they have their own data storage centers. And if your video is crappy and you’re a nobody, it probably gets stored in a slower location on-demand. So it also loads slower. But if your video is in high-demand with millions of views it gets pushed into a more accessible location (and gets higher priority for CDNs). It’s not just hosting, there is a massive amount of logic and software behind the stack.