According to the PS4 user guide (https://manuals.playstation.net/document/en/ps4/settings/controlleroff.html) it can be done, so I reckon it is either a bug in the linux driver or in the Steam software.

There was a talk about detecting patterns and writing styles at Chaos Computer Congress a bunch of years ago.

The researchers also presented a tool to anonymize text as far as I can remember.

I will go look for the talk.

Edit: Found it!

https://media.ccc.de/v/31c3_-_6173_-_en_-_saal_g_-_201412291715_-_source_code_and_cross-domain_authorship_attribution_-_aylin_-_greenie_-_rebekah_overdorf

They talk about their software to find who wrote what, but also how to use that knowledge to write software that attempts to anonymize text.