Why This Matters More Than It Sounds
Because most advice people find is brand advice — which app is good, which one to avoid — and that advice has a shelf life measured in months. A reader who learns a list of trustworthy names is holding information that expires, while a reader who learns to check a licence and a payee is holding something that keeps working.
It also explains why the market looks so crowded. Forty names in a year does not mean forty operations; it frequently means a much smaller number cycling through fresh identities as the old ones become unusable for advertising.
On App Logos Specifically
Searches for the logo usually come from people trying to confirm that an app they have been sent is the real one. It is a reasonable instinct and an unreliable check: icons are trivially copied, and a lookalike package will match the artwork exactly while differing in the only thing that matters, which is the signature and the permission list.
How to verify a specific brand you have been given is on the real or fake page, and every guide is on the home page.