Noun
Intentionally-implemented functionality of a product or service (typically technology) which hinders or disadvantages the user, and which the seller may charge users to not include.
The printer's anti-features made it hardly worth using: the small $40 ink cartridges get blacklisted after first use to prevent refilling.
(software) Functionality originally intended as a feature, but perceived as a bug, annoyance, or infringement of freedoms by some or even most users.
Source: en.wiktionary.org