The Hilton chain of hotels is on my blacklist.
In my line of business I get to travel a lot on technology project work. It will mean that I get to stay in international city centre hotels for spells of up to three weeks at a time. I don't particularly like staying in hotels, but regard it as a necessary evil. I generally sign up to the hotel loyalty scheme to accumulate points, but infrequently use those points until I'm going on a holiday with my wife. I'd prefer if the hotels just had lower rack rates for regular customers.
The Hilton Hhonors Scheme decided to confiscate my points with them because I'd not used their scheme for a couple of years. So much for loyalty! They continue to send me automated emails about all of the "opportunities" I'm missing with their hotel products. This theft needs punishment.
I now boycott their Hilton chain and subsidiary hotels. I'll stay somewhere else when in a city. I even have an automatic blacklist on their domain name so all their email and web sites are blocked and treat as Spam in our offices.