Another possible danger of technologies to artificially extract CO2 from the atmosphere, is the possibility they might be too successful. If they get out of control, could they extract too much CO2?

Natural processes are self-limiting, but with artificial processes, who knows?

Never forget that CO2 is essential to photosynthesis, and photosynthesis is essential to all life. Therefore, a minimum amount of CO2 is essential to all life. And photosynthesis really struggles when CO2 is much below 200ppm.

(Ice cores seem to indicate that it got to this level at the deepest point of the last glaciation — about 20,000 years ago. https://commons.wikimedia.org/wiki/File:Vostok-ice-core-petit.png The Earth was covered in dust, and prehistoric human populations must have found life quite a struggle at this time.)