Half of the reasons cited by major Russian news outlets are ecologically confused.
You are right in saying that Roskomnadzor is an illegal document that allows them to block everything Western and everything they consider a threat. It has long been known that this official regulatory authority in the field of communications has been given full access to decide everything.
According to the РБК news channel, the following statements were made:
Children in the game are subjected to sexual harassment, they are tricked into sending intimate photos, and they are persuaded to engage in lewd acts and violence — after all, Roblox is popular with pedophiles, who meet minors directly in the game’s chat rooms and then move on to real life.
I think this is too serious an explanation of the overall situation. One could ask a philosophical question: Why don’t parents discipline their children and control them at such a young age?
Any child today can create an account with a birth year that is many times older than their actual age, and after a while be deceived because they are literally a child.
And in the end, if we are honest, ROBLOX currently has problems with this, with games such as “Radgoll Engine,” where after spending five minutes on Russian-language servers with voice chat, you can realize the FULL seriousness of the situation. People easily imitate conversations with obscene slang, various genre themes, inappropriate and violating ROBLOX ToS.
As for LGBT+ promotion, the only thing ROBLOX can do is try to use its filters to completely remove any games of this genre from regions in Russia. For example, I am from the Russian Federation, and this is what I get when I search for LGBT:
But I am sure that this is not enough; there are many discreditable violations, especially since they have already been announced by the Russian government.