I am not sure if the ramp is from NFTs, perhaps it is a part.
Certainly at least a part. And we can even say that it is a huge part, because Splinterlands cards are NFTs, and Splinterlands is brought and still bringing thousands of people to the Hive blockchain every day.
While many only play Splinterlands, some of them are active on the blogging/social network platform too. We met a few good friends because of the huge success of Splinterlands. For example one of them is @savvyplayer. He registered one year ago (on 2020.11.28), and he is socially very active on the platform.