[olalonde]

Mining is not marketed as risk free though. I have personally made some money through automated inter-exchange arbitrage but I ended up concluding that the risks outweighed the rewards at current time (maybe intra exchange is less risky).

[antonwinter]

most of the inter exchange arbitrage opportunities are eaten up by the fees and because there can be a time delay across exchanges it also adds risk. The intra trading (especially in my case ) has those risks minimized. there are no fees on cex and the trades happen very fast.