I think it's worth being a bit clearer about what you are offering.
It mentions telephone coaching but most members here are outside of the US and that could be costly. Could that be achieved on Skype, for instance.
The programme mentions you are assigned a random group and therefore not aimed at helping us but rather the research team.
Whilst there is obvious cross over between many anxiety disorders, and bearing in mind in the UK we don't use the DSM hence there will be the potential for our conditions to differ not only in name but in diagnostic criteria, are there likely to be situations where someone could join to find it irrelevant to them? I ask this because people may be in all sorts of severity on here and this needs to perhaps be made more clear it's not a treatment (the quote below suggests no anxiety specific help at all) for them in the same way say a CBT online programme may be?
If you were not in the training condition, you will be given the opportunity to complete the training condition that we think is most effective for reducing feelings of anxiety.
This isn't meant as negative criticism as it looks an interesting piece for those willing to sign up to help research which may later become more mainstream, and others post research programmes from time to time, and it can be hard accessing therapy so some may get some faster support. It's just that some may have a different expectation. As a source this is obviously credible.