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Two students find security bug that could let millions do laundry for free
(www.theverge.com)
This is a most excellent place for technology news and articles.
I agree with the first part of your comment, but laundromats are absolutely a high profit business.
source: family friend owns a bunch of them, every single one was net profitable inside of a few months and they are now basically pure profit month over month. They make more money than I ever have from a single software development job, even at my peak, and they largely just farm maintenance out and pay some labor.
Yeah, laundromats are hard to beat, because your only real operating costs are bills and maintenance on the machines.