Hi there! 👋

Great question! There's no limit to the number of users you can have in a group in Google Threat Intelligence. You can add users using the API – it's the most efficient way to manage large groups. You'll find all the details you need in the API guide here: https://gtidocs.virustotal.com/reference/update-group-users

I also recommend taking a look at the administrators guide. It has a ton of useful information on managing groups and other admin tasks: https://gtidocs.virustotal.com/docs/admins-guide

If you have any more questions, feel free to ask!