I consider Bleachbit a useful program. It is useful for those with low space. Although modern hard drives are big, some partitions and SSDs and USB sticks are not, and Bleachbit offers a quick and easy way to free up space. There are many examples of partitions with limited space even in today's world.
It is useful to wipe files. I don't know of any other Linux wiper with a GUI, although there may be one. So, tell me of a superior alternative.

If you are selling an old hard drive on E-bay, like I do, or giving a computer away, then you should wipe the drive to eliminate any trace of passwords and identity information. Bleachbit has that capability. This is a better alternative, environmentally, than destroying the hard drive. At least some one gets to use the hardware. In older versions, Bleachbit would hang during this wipe procedure, but that bug has been eliminated.