Commodore had a nickle and dime marketing plan and made PC clones as well. The Commodore 65 was going to be the next 8 bit C64 type computer after the C128. But it never got out of prototype.
Mac and DOS/PC tech caught up to the Amiga around 1987-1992 and Amiga could not make a newer chipset in time to compete with them.
The Amiga was like the Mac but with true preemptive multitasking and 1/3rd the cost of a similar powered Mac. Amiga didn't earn a lot of money with the Amiga because they lowballed the price and Apple won because they highballed the price until Steve Jobs could come back to fix the company. Amiga had no Steve Jobs savior and went out of business because the DOS/PC cut into their sales too.