When teachers make tests on this website for students, You need to get all of the questions right. Even if students miss one question, They have to take the whole test again. The grading policy isn't accurate either. Not very customizable. Coding is kinda cheap also.
I am a student that has used it for four school year now and it really functions well. It is easy to navigate through each class and loads fast. One thing I really don't like about it is how it doesn't save your text when you have to close out of it. Other than that, it is a great website and I highly recommend it.
It's my first year using Canvas, and it's not bad. Although it can use more organization, All I need to do is go to "to do" on my iPad and I will be fine. One problem is that it takes some time to load assignments from notability. Other than that, it is alright.
Answer: It is a legitimate company. My school uses the canvas page to do online assignments and discussions and no where on the site makes me think that it isn't legit.