No. GDM has no accounts, no analytics and no telemetry. It connects to the servers you download from and, each time it starts and once a day while it runs, asks GitHub whether a newer version exists (you can turn that off in Help → Check for updates). The browser extension talks only to GDM on your own computer. The details are in the privacy policy.
Gratuito, open source, senza pubblicità, senza periodo di prova.
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