That's a ridiculous personal policy you've adopted BRL. PA28 is asking for relevant advice from the community that may also help others on the site - and in good fashion pruners are helping.
Jet-A1 clearly has no connection with whatever product he linked to, but your edit doesn't even allow one to work out what he was talking about.
You say people can mention a commercial product but not link to it, but as Bookworm points out Google's just one click away for all of us and a direct link is much more convenient for all users.
Should one censor all reference to British Airways on the site since their product is not free? Should one remove all posts referencing Oxford Air Training 'cos Bristol GS pay for advertising space? Should PA28 change his username in case Cessna wants to be an advertiser? Remove links to new Lycoming SB's 'cos Continental may be offended?
Get a grip - it's the combination of this type of vapid moderation and the bonkers change of forum description that has led to the demise of the Private Flying forum and the rise of the Flyer forum...