I actually find it interesting/relieving to have a market where insider trading is legal. If you got your hands on inside information, more power to you!

In the stock market, insider trading being illegal effectively only helps institutions who are already rich, have access to high-frequency trading, effectively do insider trading anyway and get away with it, and puts the average Joes sitting at home with an eTrade account at a distinct disadvantage.

There are things that cryptocurrencies could do to avoid insider trading becoming abused. For example, ensure that larger trades take a long time. Trades of 1000 BTC should require days to execute, while trades of 0.1 BTC should execute in milliseconds. That would help de-throne the hedge funds of the world who have access to more information than average Joe can process, and empower average Joes to leverage everything they know, without messing up the market dynamics for small quantities.