• I have a limited amount of bandwith on my mobile plan
• if i know a game download is large i go home where i have broadband; i dont download large files over mobile internet
• a text-only website can be rather small with only a few KB. It's only when you get ""Designers"" that things start to bloat, because the system fonts are not good enough and 2MB in extra fonts no sane visitor will ever notice must be downloaded.
• the marketing department REALLY needs those 10 extra trackers and analytics scripts that take 5s to load, even if they last looked at the visitor stats back in 2021 and the login has long been forgotten.
• the CEO wanted that animated AI powered talking gorilla widget he had seen on a local tradeshow where the customers can ask product or website questions (spoiler: they dont!), which ads a few more Megabytes to each pageload even before you even use it.

Then again, those 100 MB are usually mostly assets I want to look at or listen to. Certain websites contain 100 kB of text and pictures I want to look at and load 2 MB of JavaScript frameworks that add nothing to the usability of the site. Bonus points for automatically streaming a 20 MB video I don't want to watch while I look for one sentence's worth of information.

Imagine that, people don't mind when they have to wait 10-15 minutes every once in a while for their game to update, but they do mind waiting 15-30 seconds every time they navigate to a new webpage.