Why did Typepad make a Wordpress Anti-Spam Plugin?

I ran the new Typepad Anti-spam plugin for over a week and both Typepad and Akismet identified exactly the same comments as spam. I deleted Typepad - no need to have both.
This makes me curious. Why did Typepad write their own plugin? If part of the plugin’s accuracy is due to how many people have installed it, was it so that Typepad could provide their users better protection by expanding their coverage?
Akismet charges for commercial use of their plugin. Did Typepad offer this to undercut Akismet’s income?
Curious minds want to know!

Douglas Karr
As a quick aside, I have 2000+ comments waiting for moderation - Do you know a trick I can can the lot of them without wading through page by page!?!
Thanks!
Jon
My only advice is to run the latest version of WordPress. At least it’s ‘ajaxian’ in nature and allows the page to update on the fly as you mark items. Quite honestly, if it goes to Spam, I don’t review it - Akismet’s been working quite well!
Doug
Thanks for letting us know - I didn’t stop to think about performance outside of how many spam comments you’re catching!
Do you have any statistics to support improved performance?
Thanks,
Doug
Best wishes from England,
Jon