Hi Marc,
Does this also apply to moving to a different user group? For some reason only 50 members at a time get moved, even though it asks and I confirm the moving of about 1200 members to the user group.
Ideally - from my perspective - there would be a way to multi-select members via checkboxes and remove or move the ones you have checked. I can imagine you could cause a lot of harm to yourself as an admin if you don't know what you're doing, but currently removing a lot of invalidated users (I assume CAPTCHA blocked registrations) seems to be a very slow process, unless I'm missing something.
I just learned about the mass-pruning through the search result, which seems useful, but I would like to have an extra step to actually manually review what I'm removing, so I figured I'd mass-move all of the invalidated users to a temporary group first and then review the users in that group before running the mass-prune.