I don’t understand what even getting at, the data from mods isn’t some cumulative build up that takes more and more space with every download.
That’s over a space of a year or so of the site being up. The 110,566GB of data is all small chunks sat on individuals PC’s not some server our PC connects to each time we load the sim. So that isn’t 110,566gb sat on their server. Sites hold the zip file, you download a copy of it.
I am not saying that it doesn’t take resources to keep up, but having friends who have ran sites much bigger, all for free, I know it can be done smartly without harming the users and those hosting.