RAPP interview questions

Interviewed for this position after chatting with a recruiter. The interview itself was pretty standard and positive. I was told via email within an hour of finishing that they’d like me to proceed to the next round and asked me to send availability. I sent my availability and got completely ghosted. I followed up twice over the following week, no response. Beyond unprofessional. If circumstances change, the least you can do is let waiting candidates know. Red flag - glad I know now to avoid.