Who said commercial? I am thinking of the broader case here, as someone who runs various websites/tools for various purposes, quite a few of which can send you

Who said commercial? I am thinking of the broader case here, as someone who runs various websites/tools for various purposes, quite a few of which can send you email to notify you of when a player you follow uploaded a new level, when the local river is exceptionally low or rising sharply or whatnot, when security updates were applied... you may not care about these anymore and not realize that one is being a nuisance, at least to hobbyist services like mine, by just hitting spam and not using the proper unsubscribe mechanism. In other countries, I can understand why: unsubscribing isn't required to be one-click, and even domestically a lot of companies do not honor the law to the letter.