Huh... that hasn't been my experience. I notice that article uses a lot of affiliate links, are you sure it's not fear-mongering in order to sell it's special cold brew coffee maker?

Not saying that mold is impossible, but I don't think the solutions is to buy their amazon affiliate coffee maker and special coffee butter.

If you have mold issues after 24 hours of cold brewing I think you have some deeper issues at play. Consider getting mold tests for your house, sterilizing the tools/containers you use, and switching out your beans.

I wasn’t endorsing the article, merely providing it as evidence of mold following my anecdote.

I generally face it 3-4 days in, not 24 hours.