You are right to consider this your best advice. It's fundamental in the crypto world, and it's precautionary as well. I couldn't imagine how daft some people are "crying foul" online with exchanges seizing their $300k, $500k, $1m, and even more. What were they thinking to have entrusted such huge amounts to a custodial arrangement?

I guess we are learning, and we should continue to learn this way, which makes me add the "DYOR" (Do Your Own Research) advice.