Surely these mods on the other site are short sighted. If I were a mod I'd allow any relevant external link and argumentative comment, they serve to build reputation of a forum as an open, none censored, unbiased hub of discussion. Starting down the censorship and anti free speech road, people will surely come to realise the forum can no longer be considered a central hub of info and will wonder what content has been intentionally hidden from them. That would be enough to prompt me to check other forums for answers anyway, counter productive. Incorrect arguments can be talked through and shown to be incorrect, it can all add to forum interest, highlights lack of censorship and builds confidence in the forum among users.
I'm effectively barred from Lexus Owners Club forum for mentioning Lexus models converted to LPG should have a valve lube system fitted and posting a pic of a Lexus I converted. Another LPG installer advertises on the site and doesn't advise lubes are necessary on Lexus models, one of the moderators whom had his Lexus converted there censors anything that might be deemed negative against that firm as hostile content, even if content is correct and could help some of his members prevent burned engine valves.