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I suspect its just a tax break related policy1. What publicly-traded companies report to investors and what they report to the IRS are more different than you might initially suspect.
2. This $73.2B figure was pulled directly from their 2022 10-K filing[1] under an ops expense line item labeled technology and content, which includes R&D and then some. The devil in the details is buried in a footnote on p. 26:
>> Technology and content costs include payroll and related expenses for employees involved in the research and development of new and existing products and services, development, design, and maintenance of our stores, curation and display of products and services made available in our online stores, and infrastructure costs. Infrastructure costs include servers, networking equipment, and data center related depreciation and amortization, rent, utilities, and other expenses necessary to support AWS and other Amazon businesses.
At face value, to handwave this figure as just R&D and purport that it's directly comparable to other publicly-traded companies who report disaggregated research and development strikes me as somewhere between shotgun analysis and hoodwinking.
[1] https://www.sec.gov/Archives/edgar/data/1018724/000101872423...