Unofficial APKs from third-party sites frequently contain hidden payloads that can steal personal data or hijack your device.
The creation and distribution of non-consensual deepfakes are illegal in many regions, including the UK and US. Apps like Clothoff have been at the center of lawsuits involving the misuse of images of both adults and minors.
Modified versions like v2.0.3 typically claim to bypass the official app's restrictions to provide a "premium" experience for free: