Hi,
Paxful admin here!
There is no harm in the link, very simple tutorial. Actually OPs main intention was his Coinbase ref link in tutorial.
Selling bitcoin online directly to other people brings many risks on sellers side because of chargebacks from buyers if you sell with payment methods that are tied to credit cards such as Paypal, invoices, payment processors. Set your premiums higher so you could cover your losses as selling with high risk payment methods some scammers would still get through your verification process. Check current sellers on Paxful with these payment methods and what their offers terms are so you would get idea what kind of verifications they require from buyers.
Other more safer options to sell bitcoins are gift cards, bank cash deposits in US, Western Union, Moneygram. Only thing that sellers are not sharing openly is how you convert back to cash/bitcoins your payments received from buyers like gift cards, Paypal balance etc. Start little and with time you will find out all these methods. Some of sellers are doing well over $100k monthly volume in sales.
Very very soon we will come out with our affiliate program where the payouts will be 20x more than any current affiliate program in bitcoin space!