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It's easy for law enforcement agencies to link Bitcoin addresses to an individual, let alone if said individual is running a business online.
Assuming a platform like Ebay, where they would most likely use BitPay for Bitcoin payments, a seller could be easily identified since he'd be using both of those platforms.
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Law enforcement agencies try to identify the owner of an address in case of serious illegal activities. To be "obliged" to examine the small scam where I was a victim, a) crypto must be legal form of payment, and b) they must be able to
easily identify the owner of each address (complete loss of anonymity).
And what about completely anonymous cryptos?