Doesn't really have anything to do with bitcoin. It depends on what the task is, your children's age, and your goals. You bring up valid points but the benefit of paying kids for work done is teaching about work exchanged for money and the habit of valuing your work and time. Its very subjective and personal. Something you should think about and discuss with your spouse if you have one.

For me, we never paid our children to do many things. Just a few before they could get jobs or work for others out of the home. The goal is what you want to start with. What is your goal and does your actions move toward that or away from it. Paying a kid to brush their teeth doesn't match up. Paying them to do something you already pay someone else to do is different. Like mowing the yard. I can see both sides of this but my goal is raise adults that can support themselves and those they love.