I think captive observations definitely have value for other iNat users.
As for whether they help with CV, well, that’s a bit more iffy, because it is “trained” on a random selection of images, and you have no way of knowing whether yours will be one of the selected images or not:
https://forum.inaturalist.org/t/what-image-s-are-used-for-training-computer-vision/3307