• Microsoft made it impossible to install Windows 11 Home Edition without a Microsoft online account. I know of no FOSS with the nerve to try something like that.
• Non-Free games that charge real money for in-game cheats, and are of course designed to prevent you from manipulating your own game-state
• Mobile apps that request clearly unnecessary permissions, for reasons never revealed
• Mobile apps that sell your location data, and any other data they can get their hands on, with minimal regard for how this might impact your physical security
• Lies of omission about fixes to security flaws, and their specifics
• Intrusive telemetry that can't be disabled (although FOSS doesn't offer a total guarantee against this, see Firefox)
• Lies about security properties that are hard to verify without access to source code, such as falsely claiming proper end-to-end encryption
Deceptive marketing/monetisation, as in using psychological tricks to get people to spend money on things they don't want or need. Basically how every modern app and game works nowadays[0].
• Microsoft made it impossible to install Windows 11 Home Edition without a Microsoft online account. I know of no FOSS with the nerve to try something like that.
• Non-Free games that charge real money for in-game cheats, and are of course designed to prevent you from manipulating your own game-state
• Mobile apps that request clearly unnecessary permissions, for reasons never revealed
• Mobile apps that sell your location data, and any other data they can get their hands on, with minimal regard for how this might impact your physical security
• Lies of omission about fixes to security flaws, and their specifics
• Intrusive telemetry that can't be disabled (although FOSS doesn't offer a total guarantee against this, see Firefox)
• Lies about security properties that are hard to verify without access to source code, such as falsely claiming proper end-to-end encryption
• For more see [0]
[0] https://www.gnu.org/proprietary/proprietary.en.html