Modifying and distributing proprietary software is a violation of the Digital Millennium Copyright Act (DMCA). While end-users are rarely prosecuted, you are participating in an illegal distribution network.
In the case of LastPass, a mod APK would typically claim to unlock or LastPass Families features for free. These features include: lastpass password manager mod apk
, but the app wouldn't open. It just hung on the loading screen. He tried to import his passwords lastpass password manager mod apk