Maybe it's too scary or inappropriate for some people. That could be a reason.
The main reason could be that looking for specific moments out of context might lead to a misunderstanding of the plot. Also, it takes away the fun of discovering things naturally as you progress through the manga.
Maybe because looking up certain manga can be a waste of time or not in line with your interests.
Maybe it's too intense or scary. Some manga can have elements that are disturbing when you look at them.
It might be illegal and violate copyright laws. Also, the quality could be poor and not give you the best reading experience.
Looking at manga online illegally might violate copyright laws and hurt the creators.
Maybe it's because they can be addictive and take up too much of your time.
Maybe it's hard to find or not widely available. That could be a reason.
It could be that her stories have some kind of negative or disturbing content that we'd rather avoid. Or perhaps they just don't match our preferences or interests at the moment.
Maybe it's because some tattoos comics have inappropriate or offensive content.
Well, it could be that looking at tattoos in comics might lead to misunderstandings or give the wrong impression. Sometimes the tattoos shown might not be representative of real-life values or might be presented in a way that's not suitable for all audiences.