How can BSE share price fall

Just wondering how can share price of a stock exchange (BSE) fall while it has nothing to do with companies performance those are listed on it?
As per my knowledge, BSE gets profit by the trading of different shares listed on it and Its share price should increase with the time.
Same question for CDSL

It is a public listed company. Many factors affect the profitability.
Expenses goes up, Income may not go up correspondingly, losing volumes to NSE etc.
Valuations maybe high.
NSE IPO coming soon.

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