Much smaller installed base, much less money for the scammers to make.
From the article, just Delta airlines has 2,100 engines in service.
The two planes I know that have been affected by this are the A320 and the 737. Both models have had more that 11,000 built each. So at lease 22,000 planes. (44,000 engines)
By comparison the G650/G700/G800 series (EM's private jet) has a total of... 512.