How were they getting away with it for the 10 years before that when they were still calling them games and were still clearly in violation? It's pretty clear that the name change is just a retconned excuse and has nothing at all to do with the real reason.
All this happened when Roblox was private, I don't believe there was/is any monetary interest beyond whatever executives had from their employers. If it's anything like the story for getting Roblox on game consoles, then it really is executives caring about what their kids also care about, and that gives RBLX a huge leg up.
You may be right, but Apple execs are accredited investors worth tens to hundreds of millions and as such are easily able to invest in private companies, so that doesn't rule it out. Nepotism is another possible explanation if there are any connections there. And while it wouldn't be illegal while they were private, it would still be immoral, and it would become illegal when not disclosed as a risk at IPO.
It could also further jeopardize Apple's standing with regulators, since they profess to apply their rules fairly and equally without secret deals (which is transparently ridiculous but Tim Cook said it in congressional testimony so it would be perjury if proven wrong).