How does he increase his wealth via Ribis?
Bava Metzi'a 70b: It is even one who lends to a Nochri on Ribis 1 .
Malbim: All these verses explain "Tov Rash Holech b'Sumo" (6). If the start of the path is thorns (muzzling desires), the end is straight. The opposite (if the start is straight), the end is thorns. Increasing wealth via Ribis is straight [in his eyes]. In the end he will lose his money and become poor.
71a: This opinion forbids lending to a Nochri, lest he learn from his deeds. A Chacham will not learn from his deeds; he may lend to him.
What is the meaning of "l'Chonen Dalim Yikbetzenu"?
Bava Metzi'a 70b: It is people like Shevor Malka (the Persian king, who would take from Yisrael and give to the Nochrim, who are poor in Mitzvos).
Rashi citing Tanchuma: The government hears that he gets rich improperly, and takes his money, and uses it to build bridges and fix roads. This is grace to the poor!
Malbim: One who lends to the poor for free (without Ribis), the start is thorns, and the end is straight - he will become rich.
