Mt. Gox, one of the first Bitcoin exchanges, was once a leading Bitcoin exchange that apparently handled 70% of all bitcoin transactions,
If you think current big exchanges such as Binance and Coinbase are "unhackable", you might want to rethink this out.
you should have also mentioned that in comparison exchanges like binance or coinbase only handle a very small percentage of the total trading volume. it is about 0.1-0.5% for binance and closer to 10% for coinbase.
and the bold part is wrong it is not % of transactions it is % of trading volume.