For me it is when companies/services market themselves as donating to XYZ cause if I buy their product. If they want to donate, they should have already done that with the money they have. Asking me to give them profit so that they can donate is so obviously pretentious.
Paid streaming services that have ads in the UI (youtubetv). Amazon firesticks having ads on the UI. I actually complained to YTTV and they sent me an email explaining why there are commercial on live TV, pissed me off even more.