I wasn’t able to replicate this, in safari highlighting a couple words or several hundred words both worked fine, the copy option was there and stayed there both times. I tried on a iPad mini and an iPhone SE

Yes, much of the web is hosted on Linux servers, and only growing as more and more people start playing around with self hosting projects.

I disagree, the vast majority just need a browser, your use case may be quite common, but definitely not the majority.

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Yeah I always own my own modem and router, just go that way. Check your isp for which modems are compatible with the service and check the latest reviews for a good router.

Throwaway accounts will be your friend