It’s not always nefarious.
I work for a non-profit. Sometimes it’s helpful to understand the click rate on a mass message.
We don’t provide data to third parties and use a self-hosted oss analytics platform.
So I think folks should understand tracking and manage it but it’s not all bad. Just almost always bad. Really bad.
Worse: a lot of links can’t be fixed or modified since they use click-through services to obscure the destination.