"These are not $25 cameras; they are low-cost entry points to a subscription service."
The '2K UHD video' spec refers to the number of pixels (2304x1296), not the final image quality, which will be limited by the inexpensive lens and sensor. 'Full-color night vision' is marketing speak for a small, battery-draining LED spotlight turning on to illuminate the scene.
This 4-pack is for deploying multiple visual deterrents on an absolute minimum budget. If you need temporary cameras for low-traffic indoor areas and are willing to manage constant recharging and a probable subscription fee, the initial cost is low.
Anyone requiring long battery life, reliable performance, or advanced detection features without a monthly fee should look elsewhere. The unstated subscription costs and frequent maintenance will likely negate the low entry price for most users.