I don't think so. Marvel Comics has a huge fan base and a significant presence in the industry. They continue to produce comics and have various projects in the works.
I haven't heard anything about Top Cow Comics shutting down. Maybe you should check the latest news from reliable sources or the official statements from the company itself.
The shutdown of Bilibili Comics could be because of poor management decisions, insufficient revenue generation, or problems with maintaining a sustainable business model. It's often a combination of internal and external challenges that lead to such closures.
Well, it could be due to various factors. Maybe the costs of maintaining it were too high, or it didn't meet certain performance or business goals. Or perhaps there were legal or licensing problems.