Clearly you did not really understand my point.
I have no objection to the banner ads, etc. My issue is that every external link that people post is converted by the forum to instead point to an advertisers site, which then instantly redirects to the original link.
This goes against decent practice, as you're switching out the links that people post without warning, and redirecting to a site that at least according to our provider here is a security risk.
Of the many forums I have visited online, this seems to be the only one that does it. This, though, is the only one that is run for profit, so I suppose they are happy to sacrifice usability in return for more income.