Hopefully the top 20 investors will come quickly. In the US any cash transfer of over $10K must be reported to the IRS. I presume there is a similar rule in Canada. It would just invite unwanted attention.

The remaining accounts sum to more than a quarter of a million, but probably most of those will be claimed within the week

In hindsight it would have been better to have something on the website that says anything below 1 BTC has a shelf life if not divested in 30 days.

It looks like you have 3781 investments averaging about $20 apiece, but totaling over $70K. You can't really give it to charity since people could come and claim in six months, and keeping it could get you in trouble to some zealous investigator. It would be a shame to ruin a clean operation over such a relatively small amount of money.

I wouldn't be surprised if you have a few thousand small accounts that don't get claimed within the month.