Splashtop is a tool designed to grant complete control over a computer from a mobile device. If you download a modified version of Splashtop from an untrusted third-party website, you have no way of knowing what code has been added to the application.

: Cracked IPA files are often injected with malicious components such as info stealers ransomware

Software developers constantly patch zero-day vulnerabilities. If you use a frozen, cracked version of an app, you miss out on critical security updates, leaving an open back door into your home network.