Software could totally do this. A common trick to check yourself is to set a timer for every $x minutes or so [1] and then when the timer goes off see what you are doing. Software could definitely address this problem by giving you a little popup and changing the time interval so you can't cheat it. I'm sure some os-level apps already supports this feature.
[1] How long the timer is depends on yourself, i.e. how much data you want and badly you need to keep focused (tends toward shorter timer) vs. how much you pay every time the alarm sounds and you need to mental check yourself, causing a loss of focus and context switch (tends to longer timers)
[1] How long the timer is depends on yourself, i.e. how much data you want and badly you need to keep focused (tends toward shorter timer) vs. how much you pay every time the alarm sounds and you need to mental check yourself, causing a loss of focus and context switch (tends to longer timers)