A daily update is not necessary, it would then be at the level of a regular job. Once per week or even a month is enough.
Of course, it's useful. If your list saves money for at least one user, it is a successful result. Even if a scam service stops working, you have left a warning on a specific domain. At some point, someone might want to buy such a domain for regular business, but there are still references that the domain is "dirty".
OP, maybe you should formulate the thread name differently. "List Of Scam websites by Learn Bitcoin" can be interpreted as if this is a list of your fraud sites, where you are their owner. I would rather write something like "List Of Scam websites exposed by Learn Bitcoin".