I currently use TinyWall Firewall, it works very well, it’s small/portable, no complaints I even donated to the Dev but I would really prefer open source, also it needs to be user friendly like TinyWall so my non-tech family members can/will use it like they do with TinyWall.
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You can have a preference and not do the preferred thing all the time. In the example you gave, someone could generally eat “healthy food” and just have a Big Mac meal once in a while.
Can’t say I do tbh. You make it sound like if one prefers healthy foods they can’t get a craving for a burger and yet ditch the fries. To me it seems completely normal.