This is in my opinion at least the most important reason of the all. The electricity and water use isn’t that high compared to our general energy use and water waste, on the other hand, copyright is itself problematic as it just allows whoever can coerce people to sign over their copyrights (usually an employer) to have an intellectual monopoly. Not to say these reasons are invalid, but that they simply pale in comparison.
There are a lot of not that commonly mentioned reasons here, which is good, but the obvious power grab by the rich that this represents is probably the best reason of them all.
The more than 99 open tabs… 😔