They have a definition, they just won’t tell the users because it’s not a realistic definition and they plan to pull the rug out later on.
If third-party apps were only 3% of total traffic and reddit was willing to destroy its image and massively increase the viability of its only competitor just before IPO over it, I’m sure they’ll have no problem getting rid of whatever percentage of blind people who can’t see the ads reddit wants to serve anyway.
They’ve got color laser printers too, just bought a HL-L3290CDW last week to replace my roommate’s cheap Canon printer that I got tired troubleshooting every time we needed to print something. Absolute monster of a print device: color laser printer+scanner+copier+fax machine and a seamless printing process to boot.