Redis uses CRDTs for active-active architectures [1] and for some of their native data structures [2].
Riak also uses them in their data store [3].
And looks like PayPal might use them for consensus purposes (I found this while looking up the Riak talk so I haven't actually watched it) [4]
1: https://redis.com/blog/diving-into-crdts/
2: https://redis.com/videos/active-active-geo-distribution-redi...
3: https://www.youtube.com/watch?v=f20882ZSdkU&ab_channel=Erlan...
4: https://www.infoq.com/presentations/crdt-production/