Contacted through Indeed Prime. Received an expression of interest, actually with a salary, but a mess afterwards. After I replied, I didn't hear from them. Then support tried to help and got another reply asking about dates. Then nothing. Indeed Prime support sent emails, I sent emails, but not a word.

If you want to test a system, do not do this on real people. Probably some recruiter just wanted to test Indeed Prime. After an initial conversation, you may discontinue the process. But, after you contact a candidate and ask for dates, you can't just simply disappear.