Will an online minority student PhD recruitment platform be valuable in the US?
Having reviewed literally thousands of posts asking " I study X. This is my GPA, GRE and TOEFL scores. I have published a few papers. I have good recommendation letters. What is my chance getting into US PhD programs?" type of questions on this site, I would say such a central online platform is definitely useful.

In particular, I think it would be very helpful for the students to get an idea what the schools are looking for. Publishing lab openings is a good start. Some schools may be reluctant to publish their requirements in the first place. But, if many schools are doing that, many others will follow suits.

However, I am not too sure if those admission committee members will spend so much time to go through hundreds of thousands (or even more) applicants' files.
My other concerns is the information security. There would be a lot sensitive data to be looked at. So, I think to put students' data on that site may not be a good idea at the moment.