I could be wrong here but I think it's really just Thumbtack alerting other pros that the potential client/customer is being proactive and having conversations with other pros. In my field, I rarely see anymore than 3 or 4 pros tops are contacted and usually just 1 or 2. So, to me, it's always worth "throwing my hat in the ring." The potential client is generally not going to contact you unless genuinely interested so there should be no fear of wasting the $$ spent on contacting.
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