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"Industry-leading" (please note the hyphen in the compound adjective) means "they lead the industry in this." So they claim they are offering royalties which are among the best in the industry.
#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/5784 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/5784 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/