The number of molecules with velocities greater than the escape velocities is continuously increasing as a result of intermolecular collisions. The planet must eventually lose its atmosphere. However, the scattering time during which this should happen is very long and comparable to the age of the planet for Venus, Earth, Jupiter, etc. For Mercury, on the contrary, the scattering time is very short because of the low escape velocity and high surface temperature. Therefore, by Mercury, its atmosphere has long been lost.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.