Sounds like the Fidelity program is structured very similarly to that at Schwab.
While Schwab will email you any time you happen to be holding one of the securities they want to borrow in any of your authorized accounts, they won't publish the full list of all stocks they want to borrow with the rate they are paying for each. Too bad, as there are stocks I would buy and lend them if I could get 40% (you said Fidelity is paying that much on SNAP, and I know I have had several stocks at Schwab where they were paying me 40-50%).
I would much rather lend my shares to Schwab, and have them lend them to shorts at a premium, than have the shares naked shorted without collateral...I have no problem doing my part to help shorts pay for an orderly market :)
Traders give me crap for allowing my shares to be loaned out, but as a long term investor, who cares what traders think.
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