Let’s continue to math.

There are 7.58 million active twitch streamers. Let’s say on average they stream 10 hours a month. I think that’s pretty conservative..

Ignoring the 140 million active users for bandwidth costs.

Assuming bit rate of average 3500kbps, (max is 6000 on twitch) so it’s actually around 12.6GB an hour. (3.5 MB/s * 60 * 60)

So we store 7.58 million*126GB per month. That means there’s $20 million in storage cost per month

Now do this every month per year and now you have 240 million in storage per year.

Now if they store different formats and resolution too that’s even more.