If you made a mistake of buying a Samsung Android phone, I pity you. Nevertheless at least it is still an Android and the blatant greedy double dipping can be addresses via the ADB.
Specifically Samsung pushed non-removable Secure WiFi adware, that abuses notifications to display advertisements for their paid VPN service.
To remove such crapware you need the ADB.
Samsung pulled a sneaky one and named the package in an obscure way.
Here is the adb shell command:
pm uninstall -k --user 0 com.samsung.android.fast