HobbyTron.com review: Non downloaded App

Upon a search through my cell phone today(Aug21/23). I came across an App to which I never downloaded. As I am the only person using the device and do not have 3rd party or unknown downloads option turned on, I have to ask "how the f#¢k did this company manage to upload their App to my phone? And have it hidden? This was only discovered by accident. Not an app that showed on my homescreen or on my system/installed app lists". I visited the website one time and it was bullcrap big head or bobble head toys I would never use nor interested in, so I exited the webpage. Now on a side note I did arrive at this website via a link posted on a chat bubble in an airgun forum for a Mk5 semi auto 4.5 metal alloy BB gun upgrades...a Canadian forum if I remember correctly. Anyway I will be removing this "app" from my device and will be keeping a close eye on any odd or suspicious quarks with the phone.

Thank you for your time. Hopefully this goes to an establishment that actually looks into these types of issues.