What are some alternatives?
When comparing Marvelous DB and LINE Webtoon, you can also consider the following products
Marvel (Comics) API - Create awesome stuff with the world's greatest comic API
Tapas - Tapas – Comic, Novel and Stories is free to use digital comic application by Tapas Media that puts tens of thousands of comics and web novel on your mobile device.
Comixology Unlimited - Netflix for comics and graphics novels by Amazon
Piperka - Webcomics listing and subscription manager
Comic Cruncher - Visualize appearances per year of comic book characters 💥
GlobalComix - Professional Comics Publishing