What is the term for spying conducted for personal monetary benefits?

The term for spying conducted for personal monetary benefits is best captured by "financial gain espionage." This phrase explicitly conveys the primary motivation behind the act, which is to gain financially at the expense of another party. In this context, the focus is on the personal profit aspect that drives individuals to engage in spying activities, emphasizing the ethical and legal violations involved.

Corporate espionage, while related, typically refers to espionage activities conducted by or against corporations, focusing more on competitive advantages rather than individual monetary gain. Intelligence gathering, on the other hand, is a broader term that can encompass various forms of information collection, not specifically tied to personal financial motives. Data theft is a specific act that could be part of financial gain espionage but doesn't inherently encompass the wider range of spying behaviors motivated by personal profit. Therefore, "financial gain espionage" accurately reflects the particular nature of the spying being described, centering on the personal financial incentives at play.