Yeah I also get that Sony Spider-Man less universe vibe here, and especially after failure of the second Joker movie it does seem like a risky move, yet Clayface has tragic story/stories that can make for a really interesting multifaceted movie that could work as a good commentary on Hollywood but it still feels lacking without Batman.
They're making a Clayface standalone? Crazy. One of my favorites so I'm not complaining, but let's be careful not to venture into Sony Extended Spidey Universe territory.