Laptops run operating systems written by and supported by software companies. Because software is one of their core competencies, they are more likely to understand vulnerabilities and release updates to patch them in a timely manner. And they are more likely to continue releasing updates for years.

IoT devices (security cameras, etc.) are usually made by companies whose core competency is hardware. They tend to think in terms of making money by selling hardware, and the software may be viewed as overhead and of secondary importance. You are lucky to get any updates at all, and updates tend to cease long before the hardware stops working.