The only place PFAS is used in an FDM printer is the filament guide some printers have. That's a Teflon tube that the filament travels in towards the hotend.
Bowden style printers tend to have a long tube, direct drive printers sometimes have a short tube fully contained in the hotend assembly.
I don't see how PFAS can be used as a filament in FDM printer. It's not a thermoplastic, that's one of its advantages as a material.
This is legally not "unsolicited", at least in my jurisdiction.
To be unsolicited, you must not have had previous business contact with the company before they contacted you. If you have a business relationship with the company, for example because you opened an account and gave them your phone number, then these laws do not apply.
If you use your different accounts in different subreddits and never have your accounts interact, you won't be banned.