Yes, some free slot machine apps offer the chance to win real money. These apps often have in-app purchases or advertisements that generate revenue for the developers, and they might also have a system where you can earn virtual currency or tokens by playing the free slot games.
Online slot machines are typically not rigged, as long as they are provided by a reputable and licensed online casino. Reputable online casinos like Rajabets are subject to strict regulations and are regularly audited by independent third-party organizations to ensure fair play and the randomness of their games.