I don't know.
I flew a Lear for a company that hired an individual with former lear experience, but no type. The individual had money; he had no need to work. He approached the company and said he was seeking something to do, and would pay for his type and work for nothing, or a minimal wage, if the company would see clear to keep him. The company readily agreed, and though he was perhaps the closest to incompetent of any pilot I've yet met (I flew with him on several occasions, and took the aircraft from him twice), the company jumped at the chance.
I sought employment elsewhere, and left. What do do about the problem? leave aside the pilots who engage in that behavior, and boycot the companies that support it. I do.
Ignorance is no excuse, and "scab" may not be far from the mark. While union loyalists see "scab" as a term that deontes one who will cross a picketline, the truth is it denotes one who undermines his fellow pilot, who lowers the bar, and who works against the others in their efforts to succeed. This is what happens when a "scab" crosses a picket line, and this isn't far flung from those who lower the bar by accepting low or no wages on the premise that they have another income...so all others be danged.
I've met more than a few pesons who had their training bought for them by the masses, who felt no shame in buying a job...after all, they reasoned, they could afford to, and it's just a rating, just a way to "accelerate" themselves in the working world.
This is the justification of defecating in one's bed, of vomiting in one's stew. Filthy the bath for the rest and don't look back. It's reprehensible, it's wrong, and one who does it deserves no more quarter than the oft vaunted "scab."
So many hate the scab...I hate the term and have far more sympathy for the one who pursues his job without being deterred by the masses than one who buys his job and lowers the bar. In the end, however, there's little difference between the two, and the term applies in full context to both.
When my life depends on the person alongside me, and the fate of my employment depends on the high standard of professional experience that represents me and those around me, I don't really care where the other guy came from, his ideals, his hopes, his dreams, or his union membership. It's all meaningless to me. Who he is, how he flies, and weather he can do the job counts for me...and the one who couldn't get employed except by buying his job doesn't merit high on my support scale.
The term isn't that far off the mark.