Can I be punished for posting propositions to a job, but people do not answer me?

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Can I be punished for posting propositions to a job, but people do not answer me? I've read about similar cases and I don't understand if this refers to the situation when the connections were free, or it can still happen now. I submit applications for all the jobs I like, but the competition is very strong, and even if people write, the order is not made that often. I created buy a plus account for myself and received 80 connections, can I safely send applications and buy more if they run out, or do I need to send less?