I welcome more addons to combat spam. Unfortunately I do not see many attractive functions yet, but hope to see that in the future.
I would much rather see stopforumspam than any other service. Simply because SFS has a large userbase and has proven to be very effective.
The keyword blacklist is an important feature, which would make this addon stand out, if this feature would be added to the lite version.
Other features that would make this addon attractive are:
- Bad Behavior and Project Honeypot
- Registration time check (ISBOT)
- Hidden registration fields visible to bots only
- Multiple account detection and prevention
- Fake email domains blocklist
If you would combine major functions like these in a well supported addon, then that would be appealing. Both for your lite product and for your gold version.