Is it a huge red flag that girls unmatch after I give or she gives her number out?

Red Pill taught me to get straight to the point and sometimes it works and sometimes it doesn't.

Sometimes I met with matches that ask for my number or I ask for theirs after conversing like 4 lines.

Then they immediately unmatch and I either have their number or they have mine.

Should I proceed with caution going forward? I feel like some of these flakes are getting OND profile's numbers and then using these numbers from some sketchy illegal shit.