A second reason is that online dating uses side-by-side comparisons.
Instead of focusing on how compatible we think one potential partner is to us, we perform joint evaluations, which make us prioritize traits that don't really matter to relationship success.
If you use a free service, it is usually very difficult or impossible to tell who is who.
Taking online dating safety seriously is very important just in case something happens.
If something doesn't feel right then go by your gut instinct and call it off.