GMV measures platform scale, not company revenue. The company's own top line is GMV times the take-rate, less incentives, which is why the two numbers can differ by a factor of ten under gross-vs-net-revenue rules.
Treat it as an operating statistic. It is not audited, definitions differ on returns and cancellations, and a platform can grow GMV indefinitely by subsidising transactions it earns nothing on.
Example: Northwind Marketplace processes $2.0B of GMV and keeps a 9.0% take rate, giving $180M of net revenue. GMV grew 22% while revenue grew 14%, because incentives rose.
Related: take-rate, gross-vs-net-revenue, revenue, ev-gross-profit, price-to-sales