I did this some time ago without any bots or software all done manually and it is not easy to find the price difference between exchanges is sometimes very time-wasting and can be said to be lucky if you can find that difference.
Currently if there is a price difference it could be because the exchange is closing deposits or withdrawals, that may cause traders become stuck, imagine if traders do arbitrage on coins with low liquidity they will experience a big loss, so you have to be careful to arbitrage on coins with low liquidity.