I hope you're not confusing the topic particle 「は」 with the subject particle 「が」. 「は」 indicates a general topic; it is not connected grammatically to the rest of the sentence. There is nothing wrong with using 「は」 with the object of a verb.
For instance, if I wanted to say Bob spent the money, I could say, 「金はボブが費やした」. Though, it might be more likely to go like this:
A 「金は？」
B 「ボブが費やした」
As you can see from the second example, 「～を」 isn't so much replaced by 「～は」 as it is simply understood (because the noun is already the topic) and therefore left out.
I hope you're not confusing
I hope you're not confusing the topic particle 「は」 with the subject particle 「が」. 「は」 indicates a general topic; it is not connected grammatically to the rest of the sentence. There is nothing wrong with using 「は」 with the object of a verb.
For instance, if I wanted to say Bob spent the money, I could say, 「金はボブが費やした」. Though, it might be more likely to go like this:
A 「金は？」
B 「ボブが費やした」
As you can see from the second example, 「～を」 isn't so much replaced by 「～は」 as it is simply understood (because the noun is already the topic) and therefore left out.