Yes reddit might have logs, in fact it's incredibly likely that they have detailed logs about their users. however, it isn't an intrinsic aspect of a website to have logs.

I am not claiming that they don't have logs, I am simply refuting what you said, which is that everything on internet can be proven, which is an objectively false statement.

A windows or apple computer are not prerequisites to use the internet and there are no logging requisites for computers at all.

Again, logging is an active task, something being 'on the internet' does not mean that logging is happening implicitly.

IP hasn't been an admissible form of identification for over a decade now.

Now, suppose that someone hasn't been piggybacking off of their neighbor's wifi, and it leads to a household with multiple adults renting the place with internet included in the rent, how would you determine which specific person to take legal action against? Secondly, in order to actually file the suit without it being a waste of time, they would have to have independent data showing that this person did indeed do the action and aren't just making it up, in which case getting the IPs from a third party would be completely moot.