I really doubt hillbilly was referencing the marinehowto site?I can assure you mainesail does not fall into this category. He's been helping sailors and posting in those forums for years. He's as solid as they come.
But yes, if so for shame, he is the most widely respected guru on DC Electrics I've come across, on many dozens of forums.
Makes his living doing this stuff as a certified professional for large yacht owners, his contributions to educating the community are a sideline
He does accepts PayPal contributions here https://marinehowto.com/ bottom of his home page to help defray site expenses
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Help support Compass Marine Inc. by donating or sharing with your friends.

And buying stuff from his store or offering paid consulting work helps as well