Opus Talent Solutions Azure Devops Engineer interview questions

This recruitment agency sends me emails once every week with opportunities, some of which match my profile, and asking for my CV. When I respond to those, I hear nothing back, not even an acknowledgement of receipt. Sounds like they just send mass emails to hundreds (if not thousands) of candidates and respond to a small percentage of them. And then use the CVs sent for their own purposes. Suffice to say they're now being treated as spam.