To put them in at other places would have significant costs, and who pays?
With all the provisions put on the use of the images -
This webpage and its images are not provided as part of a regulated service. This webpage and its images may be useful to assist in assessing actual weather conditions at the available locations, but do not replace official forecasts or observations. This webpage or its images should not be relied upon to be available, or up to date, for the purposes of flight planning, or decision making in flight. Airservices has taken all reasonable care in producing this webpage, and republishing the supplied images, but it does not warrant they are free from error. Airservices accepts no liability arising from errors contained on this webpage or in the images provided.
An old mobile phone, or four for all round coverage, with a data only sim that sends a photo every 10 minutes.
How much?