I wouldn’t recommend watching it, but the central argument of this video is to do with software support. They argue that “open source” was more relevant prior to the internet (in servers?) due to the long turnaround time in getting a software vender (in this video IBM) to fix a bug in their software, arguing that by having access to the source code support could instruct the server maintainer what changes to make without them needing to send the tape to IBM to debug (apparently that was something they did, but it seems people in the video comments disagree with this hinting that the youtuber has no actual experience in this area). They argue that due to high speed internet support can release software fixes much quicker so having access to the source code isn’t useful as paying for support contracts is a better option for businesses rather than having people who understand the software they’re running. Apparently this is the only reason why open source is useful. They go on to argue that Linux is only popular on servers because RedHat’s support contracts are cheaper than Microsoft’s, something which I doubt and probably has more to do with the kernel and OS being easy to modify and control allowing it to be extended to a large variety of use cases instead of writing a new system from scratch.

There’s lots of issues with their argument and some have claimed it is trolling but I reckon that would be giving them too much credit. It is likely they are just an idiot fanboying for their favourite companies desperately trying to justify their irrational biases