Some hints. Here is current config at my site. Can't recomment to everyone, but that can give you some ideas.
User groups (upgraded on time basis):
1. Just registered - no posting permissions, upgraded after 1 day. Nice way to beat spammers.
2. Novice - specific for my forum. Limited access. Can make posts, but no writing access to "trading" categories. Upgraded after 30 days.
3. Full memfer
Cleanup rules:
1. Delete "Just registered" after 7 inactivity days.
2. Delete "Novice" with zero posts after 21 inactivity days.
3. Delete "Full Members" with zero posts after 180 inactivity days.
4. Delete "not validated emails" after 3 days.
Effectivity - 60%.
Also tested this rule: "delete old members, less than 5 posts, gone more than 2 years ago". - only 5% effectivity.
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