Old rusty support jack
This is a really old and rusty "do it yourself" style of jack. Its a good idea, in theory, but the materials are all wrong. What you want to see under your home is a solid and permanent solution. This is a temporary and light duty jack that was never meant to be left under the home.
More blocks doesn't mean more strength
Stacking blocks on top of each other isn't going to make things stronger. Try stacking 7 or 8 cereal boxes on top of each other, you will notice that even if you try and get them perfectly straight, they are still off center. A SmartJack system is adjustable so it will always be straight and centered.
Leftovers
Sometimes I think that people don't know what to do with leftover materials from other projects so they create ways to use them.
Yes, that is a beer keg
I guess this one needs no explanation. A beer keg is not proper foundation support.