Because daily or weekly Bitcoin trading will definitely be profitable. But the problem is, it requires quite a large amount of capital to be able to make a profit with the amount you wrote down. Meanwhile, quite a lot of bitcoin investors only have capital under $500 in bitcoin. So achieving a profit target of $20-30 per day will definitely be very difficult, even almost impossible. So to trade Bitcoin on a short-term or daily basis, quite large capital is required. The minimum is to have $5k worth of bitcoin assets. If it is below that number, in my opinion it will be very difficult.
Additionally, I personally prefer investing in bitcoin for the long term. Because I think investing over a long period of time really saves time, for example not always monitoring market movements every day. Because what I experienced, monitoring market movements every day was very tiring and other activities became a bit disturbed.
I would say if they can make a profit daily, then he can make that much profit too. It's already quite troublesome to make that kind of profit, and I believe that we are going to end up with a lot of trouble anyway, so there is really no reason to keep insisting on something like this, it's not going to really change anything.
Daily trading and making a profit from it is something hard and not a lot of people can do it, I do wish that a lot of people did, and you can, the more people buy the more we all profit, but unfortunately it's not that easy. Which is why I do not think that the amount is the problem, I think the idea itself is already difficult as it is and would be hard to make it no matter what the amount is.