Bloomberg - Had a subscription and saw the renewal coming up. Decided to cancel, but you can't do it yourself - you have to go through their service desk and of course they try five ways from Sunday to get you to reup with a cheaper plan (that then jumps to the full price after 1 to 3 months).
Spectrum (previously Time Warner Cable) - To cancel you need your account number (both the TW and the Spectrum ones for folks who were converted) and your PIN for each - which you likely setup only once and may well not have realized you needed since it's only for starting service and cancelling. Don't have them? You can't cancel. Let me emphasize that again, if you don't give them the right number they will continue to charge you until your credit card expires, and then send you to collections. I am fastidious about account info and had mine, but some of my neighbors were less so.
Were you looking for a full list (I have more) or just wanted a couple of examples?