For me scam is something that use to fool you regardless it's direct or indirectly.
The example of direct scams are: ponzi scheme, sell a fake coin, cloud mining, promote a scam exchange etc.
While the example of indirect scams are: most of altcoins which created for a sake of profit, staking program, P2P lending, centralized exchange, banks, fiat and ETFs. Why ETFs is scam? you're not holding the real coin and centralized entity could going to bankrupt.
Your scam concept is interesting. If you call banks, fiat, ETFs... are scams, are you using them? Do you use a bank account, do you use fiat currency for your life?.. If you are using those things but denigrating them then you are a liar. Instead, we should use the word "risk" which would be appropriate for the examples you mentioned.
As a bitcoin investor, we don't need to talk bad about non-bitcoin things because that doesn't make bitcoin any better in people's eyes, we don't need to be so biased.
In addition, if you are not greedy and know how to control your greed, no one can scam you. So when you get scammed, don't blame anyone, blame yourself for your greed.