If a person has a "reasonable expectation of privacy" (bathroom, bedroom, locker room, hotel room), recording them without consent is a felony in most US states (like California Penal Code 632) and carries jail time in the EU under GDPR privacy laws.
Do not download cracked APKs. The risk of installing a RAT (Remote Access Trojan) or turning your phone into a botnet far outweighs the $15 you save. If you cannot afford the legitimate premium app, then you cannot afford the lawsuit or the identity theft that follows the cracked version.
Twelve US states (California, Connecticut, Florida, Illinois, Maryland, Massachusetts, Michigan, Montana, Nevada, New Hampshire, Pennsylvania, and Washington) require all parties to consent to recording. If you hide a camera, you violate this automatically.
But what exactly are these applications? Are they offering legitimate premium features like motion detection and cloud backup, or are they gateways to malware, privacy violations, and legal trouble?