They are free to sell their cryptocurrency and then use that money as try downpayment. 

Quote from @Shiv Panda: You can buy them online, maybe even at large box stores like Home Depot, Lowes, or other appliance retailers.I did a search for "commercial washer dryer card operated" and came up with many sites that sell them.

Anyone able to advise me on the process of buying a preforeclosure property in CA or point me to a website that describes the entire process?

I figure Open Door just chose massive bundles of properties and set up a bunch of automated processes for buying, but I don't know. 

***This is SIMPLIFIED version of the process.

If they want to move up, why not sell their duplex and buy themselves a new home?

Assume the property is well located with average appreciation ...Selling some properties of mine and just curious what the average investor buyer is thinking ...Thanks guys 

After moving the tenant out, the property manager repaired the damage, and in the process also replaced the furnace and pipes and put up new drywall in damaged areas. 

Be sure to call the planning department of where the property is located to verify the STR process and procedure.

Easier to sell "knowledge" than actually do the business.