1) not everybody will use it because they won’t want to do the civil service part
2) those who do won’t have perpetual payments. Once you use it (unlike Alaska) it’s gone. If you squander it, at least there is an upper limit to your benefit as opposed to a plan that acts as an open-ended annuity. I actually think this may help foster better decisions because for many, this is their one chance at such a windfall. Of course there will be some who squander it regardless
3) As opposed to UBI, the rest of society will get some benefit in the form of service.
To elaborate on the financial wisdom aspect, he advocated for putting the money in a trust fund payable at around 25 years old. Similar to the GI Bill, you could also have strings attached as to what it could be used for (the GI Bill, for example, can be used to open a business, go to university, go to a vocational school, but not just a check for “free” money)
Instead of perpetual UBI, he’s in favor of a larger single lump sum paid out after a period of time post-civil service. The idea being instead of the slow morphine drip of $1k a month for life, you can get, say, $25k-$50k in a lump sum after serving a year or two in the Peace Corps, AmeriCorps etc.
The advantage being service builds a stronger sense of community and gives you more skin in the game. Additionally, a larger single lump sum is more conducive to helping start a business as well as being cheaper long term. It parallels the GI Bill in a lot of aspects.