All "energy harvesting" methods are pretty much a scam or marketing.

The energy you use if your daily life is generally not wasted. Moving uses the energy to move yourself, heat the space, have WiFi, etc...

Stirling engine harvesters, piezo movement harvesters, "free energy" antenna harvesters, they all have one thing in common: they can only produce such a miniscule amount of energy that you literally couldn't even charge your phone with it. For context, my phone over 4 years of charging it, has charged 2 057 444 mAh which comes out to approximately 2€ and a bit of electricity. You would spend around 10000x the money building a residual energy harvester that it would save in costs. Most harvesters can put out a few milliwatts of power which over 4 years, could only charge your phone a couple times.

For energy from movement, you are much better off making a bike generator to cycle as a workout and put power in a battery from it than any sort of "passive harvesting."