Surprised not to see this mentioned anywhere on here (or else search has failed me). Looks like nvidia have caved under pressure from consumers or oems. Great news for us! Shame it won't be retroactive, but it's a step away from proprietary tech.
https://m.hexus.net/tech/news/monitors/137186-nvidia-add-freesync-support-g-sync-module-monitors/
https://m.hexus.net/tech/news/monitors/137186-nvidia-add-freesync-support-g-sync-module-monitors/