Honestly, I don't know. You could look into its reputation in the manga community, or maybe see if there are any reports of scams or issues associated with it to determine if it's a trustworthy store.
Well, legal manga apps usually have partnerships with publishers and follow copyright laws. However, there are a lot of shady apps out there that violate these laws and are definitely illegal.
In most cases, they aren't bad. But some poorly developed manga apps might have issues like battery drain, compatibility problems, or security vulnerabilities. So, it's important to choose well-known and reviewed apps.
There are a few. Tachiyomi and Crunchyroll Manga are worth checking out. Tachiyomi is known for its customization options, and Crunchyroll Manga offers simulpubs of ongoing series. It depends on your specific preferences though.
It's hard to give a straightforward yes or no. Comic Concepts has its pros and cons. Some of their products are great, but there have been issues with delivery and customer support in some cases.