I just did a call last week on a rental property. The dryer had 4 inch PVC duct into a 3 inch abs pipe (made for toilet drain) . I hooked up a new metal duct and left it disconnected. Told the landlord he will have to change it . I would have but it was inside a finished wall and through a couple units. My drywall skills are VERY limited (i can make holes but can't fix 'em lol)
When I worked for GE (CAMCO in Canada) in the '90's they had a problem with paint peeling inside the dryer drum. It was warranty for 1 year. If the paint peeled after 1 year it was covered if they used the correct vent. If it was plastic vent it was not covered.
Now I believe the building code does not allow for PVC duct even for room exhaust (don't quote me on that). Too much of a fire hazard.