When the “Trojan Horse” was left at the gates of Troy, the Trojans thought the Greeks had left it as a pious parting gift because they had given up and sailed home. The Trojans welcomed the gift and took it within their walls, not knowing the belly of the beast was filled with armed soldiers who would destroy their city.
It was a gift, it was free – then they learned the ‘cost of free’.
Think of this when using ‘free’ software and apps. Beware.