Realistically the best thing you can do is let it go and have the satisfaction you were right. No interview is perfect, there are false positive and negative hires. Don’t take it personally.
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I interviewed with a series B company a couple of months ago. During the interview with the CTO I proposed a way that could effectively 3X their MAU. They were genuinely impressed by it, and stated they didn't think of that. Like it seemed natural, and I'm considered an expert in this field.
I ended up not getting the job, and not thinking much of it. Fast-forward a couple of months, and it's their new growth strategy. I got no credit for this, and not even a call back. Is there anything I can do?
Name and shame them, OP.
But would be a total psycho with an exhausting life for most people... So best to just learn that ideas are a dime a dozen, dont give them out for free if they are good