Honestly, just one thing, and I only need to go back to the early 90s. Just before the Internet was opened to commercial use in the mid 90s, would've made a perpetual prohibition of advertising over the Internet. Ads are what have ruined everything. Take just about anything unpleasant about the Internet today and it is either directly a consequence of ads, or an indirect consequence of someone trying hard to make you…
There would also have been no google, no amazon, no android, no kindles. I'd still be ordering everything from the Sears Catalogue, waiting 6-8 weeks for it to arrive.