To lump in bitcoin as cause for that would be the same as lumping in the average bank customers cash deposit when certain banks launder money.

@Michael Anderson If the property had been sold, it would make sense to formally assign the lease and deposit to the new owner and memorialize an agreement to collect and adjust rents after settlement, indemnify the other party for things arising during their respective ownership periods, etc. 

I would increase their deposit by that amount to ensure you have enough to cover an empty tank and a month of lost rent.

There are some lenders that require a deposit up front and is credited at closing for fees.

This method is simple, free, and fast.You could also provide deposit slips, so tenants can deliver their payment directly to the bank.

We refunded his rent and deposit. 

For many owners, this is a win.Other owners may value the consistent monthly deposits rather than worrying about the usually seasonal STR incomes. 

She co-owns other cash flowing rental with me that she paid her 20% deposit on.

A larger refundable deposit? 

They were accepting deposits to their accounts just weeks prior to announcing conversion to equity.