> I find it dubious that adding the people who don't find it financially feasible to use childcare to cover working hours will generate tax revenue to cover this due to the low income and low tax nature.

You can actually think through your belief. The announcement provides a concrete number: $12,000 per child. Do you generate $12k in tax revenue? Note that this means direct and indirect tax revenue, not only from your job and what your employer earns from your work but also with your own expenses that you can cover by having a job.

Yes, I understand that and still don't think that adds up. Things like SNAP for a family of 4 would be less than $12k per year. And that increased tax revenue would have to offset the currently working and paying families that will now use the program. We would have to wait for the experiment to conclude to see what the increased earnings for participants will be.