It seems to me that robots, artificial intelligence or aliens will begin to conquer, first of all, the hearts of people.
And they will attack primarily young people.
The first signs of such an intervention will probably be a sharp increase in the number of people deeply in love.
This is when people begin to fall in love en masse, to find their halves all over the world.
In general, it will be a happy time for humanity, when smart robots or AI will begin to fine-tune the hearts of people in such a way that as many people as possible find worthy couples and literally go crazy with each other.
In the end, almost all people on Earth will be head over heels in love with each other and only wish to remain in seclusion.
Such people, of course, will be very easy to defeat and manipulate them at will.