Well, most IP cameras cannot be accessed this way when you look at the global pool of IP cameras. However many on them on Amazon, particularly from OEM companies like Reolink that are more of a custom relabeller vs. a real camera manufacturer have all kinds of backdoor access methods.

Best practice is to put your IP cameras on a separate isolated network, connected to a dual-NIC recorder/PC running trusted software (eg: not some random DVR/NVR on Amazon) for recording and viewing. This is not a perfect solution, but it at least takes you far away from the path-of-least-resistance pool of devices with weak cybersecurity that are prone to various exploits.