But X still uses Y!
Brings to mind the days when DEC PDP-10s were considered mainframes, and someone gleefully pointed out that a certain growing non-aerospace Seattle company used one for its business infrastructure, rather than "dogfooding".
The response was a (slightly later) statement from said company that it did not own or operate any such systems. Not mentioned: These functions were now carried out by independent contractors (coincidentally former employees) in leased office space (coincidentally) formerly occupied by the same people and equipment. But _technically_...
(IIRC. Anecdotal, this may not have happened, Don't believe everything you read. Where did I put that lawyer's card?)