Go y'all!
Are you keeping track at all of the results? E.g., do stated goals get met; do participants get more done than they did prior to participating; do participants get better at not stating goals they aren't going to get done, etc.?
do participants get more done than they did prior to participating
We just started, so it's hard to answer with confidence. Since many of us (like me) did not previously keep track of goals it's hard to say anything with precision, but subjectively I find this setup motivating: the thought of public commitment and potential money loss pops up in my head quite a bit.
Related to the recurring topic of akrasia and anticipated near-mode losses, here's an article about "Gym-Pact," an arrangement whereby people precommit to pay penalty fees if they don't stick to their planned workout schedules.
In other words, they aren't charging customers money in exchange for a service, nor for violating an agreement associated with a service... rather, they are charging money as a service.
Had I encountered this in fiction, I would have considered it satire.
(I'm being somewhat glib here, admittedly: in this "experimental" phase, they are giving people free gym memberships as part of the deal, and using the penalty fees to pay for the memberships. But that doesn't sound like the ultimate business model.)