But that would still be a terrible assertion since many other companies are generating a lot of revenue in the space. You might more properly be able to say tha

But that would still be a terrible assertion since many other companies are generating a lot of revenue in the space. You might more properly be able to say that they have a monopoly on profits in the space, but that would be an ill-formed claim because "profits in a sector" are not a valid parameter for monopoly, except in the colloquial sense.