1) The so-called "dangerous ones", can be those that will play games, because they may have designated a target or are abnormally obsessed due to bad psychological issues.
Normal people, even more so for those of higher status, are likely not to have the patience to put up with detected nonsense or silliness.
2) Some are experts at online dating and playing along with such games, while others are not.
The filter that is created, are those that will say or type what the other wants to hear. So instead of a genuine interaction, it's lots of con games.
3) Stringing people along does not nor has ever proven to lead to successful long term relationships.
One of the major flaws in such thinking, is that by initially frustrating others, it will make them "prove" themselves. Some even taking it to extremes, to weeks and months.
However, this abusive behavior can become a filter, which leads to encountering those that will simply want to "climb the mountain" for revenge. After obtaining the relationship, its all the more sweet for them to break that person's heart (who initiated the game playing) by suddenly going ghost or bad treatment after having "accomplished the mission".
Overall, better to treat people as you wish to be treated and to be genuine in the interaction. Playing games, often leads to encountering those that like playing games too or possibly worse.