It's hard to say for sure. They might be rethinking their strategy or have run into financial constraints that have halted new comic production for the time being.
Absolutely not. Porn comics are often not safe as they can promote unhealthy behaviors and distorted views of relationships and sexuality. They may also violate legal and moral standards.
Definitely illegal. Producing, distributing, or possessing child porn comics is a serious crime because it violates the rights and safety of children and is against the law in most countries.