In my particular case (as was the case with most forums in the day), it was really just about spamming boards with links to whatever shitty ED pills or crypto scam they were trying to sell.
They were never really sophisticated, but never really had to be either. A spammer could spend a few minutes writing a script for a bot to crawl the web looking for phpbb signup pages, then try to create an account on any it could find and immediately post the links. They could post hundreds of links on dozens of different forums with just a few minutes work - and then do it all again tomorrow with a bunch of new signups.
I got rid of my icon ages ago - one of the great strengths to me is the ability to customise the taskbar as you see fit, you can remove literally any icon you don’t want there. Even the URL/search box if you want.
About the only time I see anything pocket related is when FF updates and there’s some blurb about it in the ‘new features’ page. Otherwise I pretty much forget it exists.