Blockchain analytics are a big sector. Companies like Coinbase and Binance have spent billions acquiring blockchain analytics firms.

Additionally, I think there is big money in selling blockchain analytics to governments for the money laundering, darknet markets, and fraud sector.

https://www.coindesk.com/markets/2019/02/19/coinbase-acquire...

https://www.coindesk.com/business/2021/04/30/coinbase-to-acq...

https://www.cnbc.com/2021/09/09/mastercard-to-buy-blockchain...

https://www.coindesk.com/markets/2019/12/03/binance-acquires...