@unknownfactor don't get me wrong, I don't care if you read pirated manga. I'm here too, yeah?
It's hard for me to accept it as misleading when they were pretty upfront and made an announcement about it, and the group section of each chapter says "MangaPlus". Also, it doesn't take you there automatically and warns you beforehand.
While the reader is not as good, it's decent and the mechanics are pretty much the same, and I it's not what would prevent me from reading it there, and from our conversation so far, doesn't sound to me like it's you main reason.
I understand that someone might not like the website, or might not want to enter for whatever reason, I'm not trying to convince you to use it.
I don't understand someone who would go calling something like linking to the free official release "gross", when it's just another way to support the official release (and doesn't technically require anything from you).
EDIT: btw the chapters don't disappear, they just become unavailable (you probably hid unavailable chapters in the settings) because they stop being free (which again, isn't different in any way from linking to websites where you can purchase volumes).