Institute sending messages to work in the Live projects because they have to earn money from students and first of all there is two benefits to institute.
1. They will get money from you.
2. They will get free employee as a Interns to complete there project.
So, what the student is getting here, that is only less part of coding because they will not give you full project. Because that project will be very risky to give unfamiliar student. So there main motive is to get money from you. But I am not saying about all institution because some institution providing free training because they need students to finish there projects. So you have to see which type of institution is sending message you. And check proper website of that institute and also enquire from your other friends about that institute. But my views is only adopt these type of institutes when they provide free training otherwise not opt.