Thought it would be valuable to mention but I was selling on Vertex and the buyer reversed the PayPal transaction, Vertex refunded me 80% of the transaction. The support is really good, they helped me as soon as I opened the support ticket.
You still lost 20% and it is a large amount in a big transaction.
I have seen someone that wanted to buy Bitcoin through LocalBitcoin but ended up getting scammed. He tried to blame it on LocalBitcoin but after I discovered the story of what happened, then he was the one that made the mistake. He wanted to buy bitcoin and the seller told him to contact his WhatsApp number, and after he contacted the seller, the seller sent him a payment address that's different from what's on LocalBitcoin and he stupidly paid in money and that's it, he lost it. Instead of him to make use of LocalBitcoin escrow service, he decided to go through WhatsApp to avoid the fees and that's how he lost his money. People really have to be careful.