who can that work against lol
Anyone with a floaty, slow horizontal aerial speed (peach, luigi), fast fallers (spacies), heavies (D3, Bowser, DK), air stallers on the last few jumps (Metaknight, kirby) just off the top of my head.
If you immediately think Metaknight will get out just because of his options for recovery, he can tornado, but he will be out prioritized by the bike. He can shuttle loop and get hit by it. He can dimensional cape but lose his jumps, and he can foward B but still get hit and lose jumps. About the only thing MK can do is glide away accordingly, and that isn't a given either, considering he may have already used his glide doing something else, or he might simply mistime his glide versus your bike up throw.
These scenarios are all predictions and based loosely on mistakes, but for the most part they limit what the character you're fighting against's options are TO get outta the way. For the best results, chase them to the other fourth of the stage near the ledge where you hit them towards or they just happen to be in the air above (like FD, way up in the corner or something, like Metaknights happen to be up there sometimes after a hit...) and utilize your bike there. You're basically planning for their return to the ground and the bike almost immediately guarantees their descent to the ground is faster, or they are trapped in the bike.
This is just some examples. There are more things you can do, but I'm sure you'd have to have the patience and reading skills and also have the ability to mix it up so you're not too predictable.