Are colleges like Shiv Nadar University, Bennett University and BML Munjal University really good college for engineering or are they just like other ordinary private college looking to make money?

Everybody wants to make money. So do these colleges. The term nonprofit means something entirely different from what most people infer from a variety of contexts. However, all these colleges are providing good quality education, are hiring extremely talented individuals to teach their students. Especially since they’re backed by well funded trusts. In today’s world, quality goods and services often come with a hefty price tag. Even after heavy subsidy, IITs no longer remain low cost institutions. Also, an institution as a whole never aims to be a poor quality education provider that is looking to milk it’s students for money. Institutions are as good as the people that support and facilitate it’s functioning. The three colleges you mentioned are all great educations of further study.