Zelle services in itself, is fine...person to person...the issue, as addressed by this thread, is the fact that a plethora of known online scammers almost exclusively use Zelle or Venmo as the main form of payment, while excluding credit card payments because they know you can't get your funds back.
According to Business Insider, Zelle doesn't offer protection from online purchases...
"The biggest drawback of Zelle is that it doesn't offer fraud protection for authorized payments. In other words, if you purchase something online and use Zelle to pay for it, you have no recourse if you never receive the item you paid for. For example, if you use Zelle to purchase an item from Craigslist, and it turns out you were scammed, Zelle won't refund you. Thus,
Zelle advises that you only use the service to pay people you absolutely know and trust."
Click the link below for the article...
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Zelle is a safe way to send and receive money — but only from people you trust)