Those who follow tech, are involved with finance and or some other areas likely can figure out what happened with Marathon Laundry Appliances.
In tech it's all about seed and subsequent rounds of funding. Ever since Microsoft, AOL, Facebook, Amazon, Paypal and tons of others everyone wants to get in on bottom floor of next big thing. You put up money, get stock and other options, if company takes off and sold those options make someone often quite a lot of money.
Of course not every start-up becomes a Facebook or Amazon, but there are plenty not willing to miss an opportunity, so they will make initial investments in a start-up and see where things go.
Mr. Glenn Reid has a pretty decent C.V. far as tech goes, which helps enormously when going around looking for seed money. People knew his name and or could find out about him and so forth. Having the "Apple" cachet likely didn't hurt either.
Marathon Laundry had been around since about 2016, so that's about seven years to establish a track record of sales and get market feedback as to how product likely will sell.
https://www.crunchbase.com/organization/marathon-laundry-machines
https://mkestartup.news/marathon-laundry-machines-the-remedy-to-big-laundry/
https://reviewed.usatoday.com/laundry/content/hands-on-with-the-marathon-washdryer-combo
Mr. Ried's whole premise of Marathon laundry machines was sort of based upon Telsa and some others. Take something someone else had already built, modify it, then sell as a new product. Thus instead of doing R&D and all the other work that comes with bringing a new washing machine or dryer to market Marathon took another approach; modify Speed Queen (or maybe GE, LG or whoever else they could latch onto) washing machine to create a washer/dryer combo. This was likely bound to end in tears as you're taking a product not designed to do something and shoving totally foreign equipment inside and trying to make it go.
https://www.wired.com/2016/01/marathon-laundry-smart-washer-dryer/
My hunch is Marathon Laundry ran out of cash (or was running very low) and was not able to raise further needed funding. This could have been for a host of reasons ranging from poor sales/market acceptance to fact Marathon simply lacked ability to produce and deliver reliable product.