While ReCaptcha at the beginning worked great and not only rooted out spambots but also encountered very few problems by regular users, sometime at the beginning of the month things changed and not only did some spambots get in but more and more users are having issues with it. It does not make much sense why this seemingly happened all of a sudden, and I wouldn't be too sure that the spambots being able to create accounts and some users having difficulties is a coincidence...
The way I see it, we should likely proceed like this:
- We try to investigate and figure out the issue and resolve it
- If initial investigations do not turn up anything useful, we temporarily switch back to ReCaptcha v2 while continuing to attempt to figure out what went wrong (potentially keep V3 on some wikis only?)
- Consider alternatives such as QuestyCaptcha if it's clear that the issue can't be found