How do we reconcile the statement that a vow is disliked because it is used to extract [charity] from the miser with the fact that it is an act of worship?

Question:
He says: Honorable Shaykh, may Allah grant you success. It is mentioned in the hadith that a vow and that it is disliked, yet it is an act of worship. So what is the criterion for identifying an act of worship?

Answer:
Fulfilling a vow is an act of worship; fulfilling it is worship. [They] fulfill their vows, and let them fulfill their vows. Fulfill his vow. Whoever vows to obey Allah, let him obey Him. So fulfilling a vow is worship. As for entering into it from the start, it is disliked because it puts a person in a difficult position and obligates him to do something. He may be unable to do it, and it may be hard for him. Also, this indicates laziness, and that a person does not perform obedience unless he vows to do so. That is why it is said that it is used to extract [charity] from the miser, meaning he does not worship Allah except through a vow and by obligating himself. What should have been done is to perform the obedience with ease, because Allah did not burden him with it as an obligation; rather, he does it by choice without obligating himself to it, and he is at ease. If he wishes, he does it, and if he wishes, he leaves it. But if he vows, it is not permissible for him to leave it; he would be restricting himself. Yes.