You may also want to look into
vBulletin, as used by this site. It's not free, but it has a lot of useful admin and user features that make phpBB feel rather primitive (particularly version phpBB 2).
The phpBB group for bots is presumably for spiders such as Googlebot, as kelevraco mentioned. They self report as bots (via the browser string) and won't try to register for your forum or post about viagra.
Spam bots can be a real problem. I used to look after a forum on a fairly low traffic site that at one stage was getting 10-20 bot registrations per day, despite using a CAPTCHA and email confirmation. (Actually, most of the bots would fail to confirm their registration and many of the ones that did wouldn't post, but I still had to spend time deleting all the accounts.) It got much better after I moved over to reCAPTCHA, with just a few getting through now.
I imagine the situation is much worse on more popular sites like this - big warning on signup here:
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SPAMMERS MAY LOSE THEIR EMAIL ACCOUNTS. PLEASE DO NOT JOIN THIS FORUM TO ADVERTISE YOUR SITE.
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