I'd normally be with you on this and I get the sensitivity to cryptocurrency (more-often-than-not-snakeoil) posts, but I think this is interesting because of the broader implications:
(1) Keybase is an interesting product -- on its own, it's a great product (I've been a user since before `kbfs`) that's well designed, its architecture and implementation is interesting and its features are practical/useful to a lot of us. I don't know that they've made public/private key cryptography accessible to everyone, but it's a far cry from every other attempt I've seen.
(2) At least, for me, I didn't understand the reason for Stellar's integration. A lot of people ran to "quick buck"/"another crypto-play", but it just didn't seem consistent with the way keybase had been operating up to then. There were already many shared technologies involved, along with a company that, thus far, has had me excited with every new feature announcement, I remember saying "not sure how good of an idea this is, but if it can be done, they're the ones that could probably do it".
And their purpose for the currency, from what little I (probably don't) understand, is not to hold/trade but use it to purchase.
I hadn't touched the Stellar wallet feature, at all, because I didn't care to figure out how to put cash money into a crypto account "for no reason". I'm not a cryptocurrency investor (I've mined a bit). The thing of it is, I cared so little about it that I didn't even bother looking if there was a reason to toss some funds in. Now I don't have to and they just bribed me to investigate, further.
I'm guessing this is mostly a marketing play. Hopefully I'll find some good reason that I want $20 in Lumens; if that's the case, then they saw what was needed to hack me.
I think the interesting thing about a cryptocurrency working with keybase is that it is a solid solution to the "am I sending this money to the person I think I am" problem. If I owe someone $20, I might or might not know their venmo name, or their bitcoin address, but I probably know their handle on github, hacker news, twitter, reddit, etc.
The fact it's tied to a Keybase wallet is important because Stellar's path payments functionality was just launched on Keybase. To summarize, you can use Keybase to send someone any asset they'd like using any asset you're holding, all on Stellar's decentralized exchange. It happens transparently behind the scenes to convert assets: https://www.stellar.org/developers/horizon/reference/endpoin...
Seems like every other coin/product giveaway to seed users on a platform, but I'm not super familiar with the Stellar network.