I would be surprised if Cash app was black listing nodes. There are many reasons why a lightning payment might fail. Have you opened a support ticket? I would.
If it were me I would use something like Phoenix to accept payments from cash app and then move to your node.
Yes, I have phoenix and use it as my primary.
One reason I sometimes use CashApp is sometimes phoenix gets stuck "Connecting to Electrum" and can't make payments for several minutes.
But the larger point is I'd love regular old folks to pay me via CashApp instead of instructing them to take an extra step with a secondary wallet. Beyond the friction of extra steps, if the user wants only like $5 worth of services, Phoenix is also going to take a good chuck of say that for channel opening fee, which will seem predatory to a first time lightning user.
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