There are 17 comments in this thread as of this writing, half of which are me ranting about it and a bunch of others being people unhelpfully telling a concerned parent to google what it's about if they don't know why Roblox is bad.
As far as I can tell his has increased awareness by one person. That is much, much less than 0.01%.
If you want awareness of the people that matter you want to get to the mianstream press, who have way more reach than Change.org, particularly with that demographic.
Once again, this is very ineffectual on all stated goals. Whehter that's by design or through incompetence I can't tell.