The dangerous case of custom hardware making a software business significantly more efficient: This makes disruption and competition even harder.
A competitor would need either a different model to keep costs low (limit video length/quality, the vimeo model of forcing creators to pay, or go for the netflix-like model of having a very limited library), or very deep pockets to run at a loss until they reach youtube-scale.
I'm still mystified how tiktok apparently manage to turn a profit. I have a feeling they are using the 'deep pockets' approach, although the short video format might also bring in more ad revenue per hour of video stored/transcoded/served.
It probably means that, unless you have a groundbreaking algorithm on something that is available as hardware, you simply do software on something that is not "perfected".
It trims marginal improvements.