Self-scans reveal that Pegasus, an invasive and powerful spyware that can secretly control phones and track owners, might be more widespread than previously thought. It was discovered on the phones of everyday phone users.
From wikiHow: How to Check Your Smartphone for Pegasus Spyware
Amnesty International provides a FOSS tool to check your mobile backups for traces of the Pegasus Spyware. I’d trust that over a sketchy proprietary app. Link: https://docs.mvt.re/.