I think with Zelle the buyer can call to the bank and reverse the money. I am not sure about Venmo.
Zelle/Venmo/PayPal are all reversible payment methods, so dealing with them will be dangerous.
If you send Bitcoin (ir-reversible) and accept Zelle/Venmo/PayPal, you bear the risk that the other party will not reverse the transaction, so it is better to do it with trusted people and you avoid doing that with untrustworthy people.
Good part: You can do business with anyone and you do not need to be trusted or have an old deals record.