What it shows is they specifically didn't grow their marketshare with the clone program and thus the clones just competed with Apple built Macs.
But today it's different, Apple is a cell phone company that has a tiny little computer business attached. Even if it starts to lose money they can keep it on as a development platform. Want the the SDK for IPhone 11, just buy our 2019 Mac Mini for $1500 which has a low end CPU+4GB of RAM and embedded graphics and 1 Thunderbolt port, don't forget to buy hubs and adapters if you need trivial legacy devices like mice and keyboards!