AA has (or had) special fares that would credit on distance vs. revenue. The most common ones were bought through AA Vacations, but not exclusive to that. So there was a separate earning chart for those. I think they've mostly disappeared, but still today opaque fares, like consolidator fares will credit as special fares on the appropriate fare code. D fares in that are 75% cabin bonus, 100% distance, and whatever AAdvantage status bonus you get (mine is 120%). Most RTW fares used to fall into that with AA but seems less and less likely anymore.

BA had initially said they'd treat RTW fares the same way. And there is definitely an easy way for them to know if it's a 'native' D fare vs. a RTW D fare, as your fare basis would be DONEx vs. whatever native D fare they had offered.

I have my first recently QF issued RTW segment on an AA code next month, so will see how it credits. Last time on a QF ticket they credited as distance, but my CX ticket had them credit as revenue, which was pretty awful.