Ditto on the Fidelity Amex. I've got three American Express cards that are administered by Amex, and those are certainly a no-go. It's not a cash advance, but you get no points for it. It's really only useful to reach minimum spends or as a free cash advance. The Fidelity Amex is administered by FIA card services. Because of the 2% cash back on all transactions, it's also a popular one to use for the credit card loads on Serve.
Really though, using my Chase Ink is the better option. Not through a CC load. I've been buying $200 Visa gift cards at staples and loading them on to Serve at Walmart. I make ~$5.36 for each card that I load after the fees ($6.96) and visasavingedge discount (1%) after the 5% cash back at Staples. There is a Staples and a WM virtually right next to each other near me. Last week I bought 8 cards ($1600), and then loaded them at the Money Center Express kiosk. Took me maybe 20 minutes start to finish and I made $42.91. You can only do a max of 5k a month of cash loads per Serve and $2500 per day at WM. Some people just do money orders at WM instead of using Serve. They only charge $0.70 for < $1000 MO. So you could buy 5 cards for $1034.75, get a 1% rebate from VSE for a credit of $10.35 and a net cost of $1024.40. Then you buy a MO for $999.30 with the last $0.70 paying for the MO. You just converted $1024.40 into $999.30 for a net cost of $24.1 with 5122 in chase ultimate rewards. Those points can be converted into $51.22 USD, or used towards travel at 125% of value.
*As all things in this manufactured spending industry, trends, techniques, risks, and success change daily. Proceed at your own risk. Don't spend more than you can afford to pay off, or buy more than you can liquidate through standard methods. In other words, don't buy $10k worth of gift cards and then not be able to pay your mortgage because Walmart changed their PoS systems to block this last night.