That grub screw isnt adequate. And the fuse contacts are not adequate. Resistance is bad. + If it gets a tug, and pulls out from the boy racer grub screw, then theres whole batteries capable of thousands of amps connected to loose cables... It just doesent look secure.
The hydraulic crimpers that I and others here have are cheap, and work great. But crimping alone, with andersons or the ring terminals isnt secure enough either as the materials are too soft/thin to be tight enough. I always ad 3 strips of cored solder, and lightly flux the cable bared end before crimping. Then just heat up the crimped end until I see the solder melt/run, and dip in a glass of water. Then add heat shrink with a cigarette lighter. Nothing else is really edequate.
Both for physical strength or resistance reasons. Trust me its a good investment.