Even enabling the toggle itself is considered a security‑related action. Developers recommend turning off OEM unlocking once you no longer need it, because leaving it enabled reduces the device's defense against physical attacks.
Sending you through multiple "ad-fly" pages before the download.
Banking apps, mobile wallets (like Google Wallet), and high-security apps (like Netflix or Pokémon GO) utilize security checks (Play Integrity / SafetyNet). They will often detect the unlocked bootloader and refuse to run.