As you can see we'are adjusting the arbitrage level to a very modest level purely to give a minimum level of protection for miners so that the mining profitability wouldn't drop into unreasonable levels.

Also, there are many services doing internal protection measures and leveling to make sure service is optimal for all involved parties (even exchanges at some levels). Probably the main difference is that in our case we decided to do it in a completely transparent and public open manner since we're big supporters for open market and transparent services.

Kind regards,
NiceHash