I'm speaking from experience. Feel free to do a simple Google search.

I agree entirely! I found out because I had a disagreement with the way my HOA was handling something, and had missed an email but found it after telling them I didn't see that specific email.

They came back with screenshots of their tracking system showing that I had just barely opened the email.

Nope. Gmail does nothing to block those trackers. I'm unsure about Yahoo.

Sometimes coins don't get ejected but don't get counted either and end up in a separate container meant for trash, damaged coins, and other non-coin items.

Coinstar has their employees ship any coins found in that to an office that definitely profits off of them. Corporate also been known to go to random machines, and put in specific coins that will go into that container, then watch for the employee to send it in. If they don't send it in, coinstar fires them for stealing.