To be honest I rarely read them. They're usually too long. Maybe they're deliberately made like that so people won't bother and they won't know what they're letting themselves in for. But even if I did read them, it would take me a very long time and in the end I might well not be much wiser because I tend to get stuck on ambiguities, and if there's an ambiguity there, I'll probably find it.
If it's tracking and marketing they're warning about, I have fairly good ad blocking so I'm unlikely to actually see any ads even if they do track me, and on the Web I don't often allow scripts that aren't essential for the website to work, so that probably messes up their game. As for my responsibility to stick to my end of the agreement, AFAIK it's not a criminal offense to transgress that, though obviously I run some risk of getting locked out if I do. So it's rather subjective how much attention I pay to these things, and depends on what it is, who provides the service, and what I know about how good, evil, or fastidious they might be.
As for software, if I particularly distrust the maker and I think they might be phoning home with info about me, I might take steps to make that more difficult. I rarely read the terms because I hardly ever use software that has to work in conjunction with the maker. So it's mostly local, offline programs and as far as I'm concerned I own my copy of it and am morally allowed to do what I like with it. Most of what I use is freeware, and most of it is rather old and was made before the developers learned how to play dirty tricks on the users. If I smell a big rat I'm likely to stop using it and look for something a bit more free of binding agreements and cunning traps.