Ask HN: India tech industry, discrimination to ones without tier1 college degree

Why the Indian tech industry is so ignoring and stereotyped towards people without a degree from tier1 college? It has become impossible these days to even get a SE or developer role interview if you don't have a tier 1 college degree in India. More and more job postings these days specifically mention tier1 college degree as a requirement. Its seems no matter what the degree matters the most because there are many instances I personally know of people with tier 1 degrees getting an interview than another guy even of the other guy has way better open source contribution and projects. Why is such high level of discrimination prevalent in Indian tech industry?