What do they do with it?
The KKK will be delighted at how much they can say nigger online and how popular racist jokes are, only to be massivelly butthurt when they realize so many catholics, irish and other people they also hate are there and they can joke right back.
Also porn. Old timey, mostly softcore, but porn. Every prostitute worth anything gets a OnlyFans.
What kind of internet technology? Are they going to start out with early internet where it was mostly people posting fanfic on their hand-coded HTML pages and money was nowhere to be seen; or modern infrastructure with fully realized stores, video streaming, massive tracking systems, and bots handling a significant fraction of the workload?
Oh yeah, for sure. Email's going to kill the post office for one thing. But there's an enormous difference in the implications between basic email, static text pages, and five minutes to download a JPG the size of a postage stamp vs. Amazon, YouTube, and Facebook.Even complete pre-historic web 1.0 stuff is massive for them. Just the idea of you being able to write something, and then anyone in the USA being able to look at it at almost real time by just typing a link would like super telegraph for them.