I believe it's 33%, not 50%. As Daniel said 3:1  offsite:onsite.  So I assume it means if your offsite is 3 btc, your onsite should be 1 or greater if you want to further divest your onsite.


So my understanding is there were basically 2 changes. The first which was longer ago was a change of max-offsite ratio of 5:1 to 3:1. No one was grandfathered into the new limit, however the limit only kicks in when investing/divesting in a way that increases your offsite percentage (i.e. no one was forcibly divested).


Then there was a second change, which was effectively setting the max-offsite ratio to 0:1. However, people with an existing offsite were grandfathered in with the old max-offsite ratio (3:1) when divesting onsite, but also restricted from further increasing their offsite.

BTW a neat trick to decrease your onsite:offsite ratio is to invest onsite at the same time as divesting offsite. That means you don't have to pay dilution fee.   (as you're not changing the size of your stake against the "virtual" bankroll)