The use of migrated accounts has been in a few threads on this forum so I'll keep this short, although I think it very much relates to this thread. BMZ is currently 4th in the Darwina rankings, obviously this will move but half way through a month things seem to move a bit less. This is a strategy that has had gains in the past but since being migrated has struggled to make any profits.
It was migrated 6 months ago and has been on a loosing streak ever since but because its got some gains this month is ranking highly in Darwina.
To me this points to a strategy that hasn't been adapted for a different broker and therefore will continue to loose.
If the Darwina rankings took a more 'mid-term' view like the last 3-6 months to help workout the rankings this strategy would be seen to be loosing value and shouldn't be ranked anywhere in the Darwina rankings, especially as high as 4th.
Just my opinions of course but I don't think this helps with the mission to bring good traders to the top and invest in them to allow them to live off their trading, strategies like this take money away from genuinely good systems that could make something from the investment imo.
(Edit, I've got nothing against the system or the provider btw, I just think its a good example for how the rankings can be a bit wrong and migrated accounts can increase the issue)