The person who hosted this gacha really should have been contacted in private before posting a "Beware!" post on the forum; people make mistakes and the individual may not have known the issue had existed. If the person was contacted and in response said "LOL SUX 2 B U" then I could understand why this post is being made in the public.
Even if it's truly a mistake (and I'm sure it was; did anyone really think they'd benefit by stealing a whole whopping 40L per gacha play, when they took the time to actually rent at Too Adorable and to be part of the community? I sure know I wouldn't risk duping fellow community members for 40L a pop in my hobby!), it's unsettling that this person has this post against them and the damage is done. After reading this, I sure hope I don't make a wrong move in any way that may put a notice of "Beware of Deer Thistle! Don't be a victim to her marketing ploys!" to the rest of the community without being addressed prior to what may have been a simple mistake.
Just by name-dropping and by not taking this to IMs/forum PMs/notecards/etc, their name is now tied with this "Beware!" post whether intentional or by mistake, and that's a shame. Despite most of us portraying flawless avatars in-world, we're all human behind the screen and bound to make mistakes that should be confronted in private before considering shaming the individual in public.
Edit: I hope that both parties can resolve this matter amicably in private as it looks like Mon Merryman is also present and offered to alleviate the troubles the gacha caused on accident.