Adam Clarke on Psalms 69:22

Let their table become a snare - The execrations here and in the following verses should be read in the future tense, because they are predictive; and not in the imperative mood, as if they were the offspring of the psalmist's resentment: "Their table Shall become a snare; - their eyes Shall be darkened; - thou Wilt pour out thine indignation upon them; - thy wrathful anger Shall take hold of them; - their habitation Shall be desolate, - and none Shall dwell in their tents."

The psalmist prophesies that the evils which they had inflicted on the Israelites should be visited on themselves; that as they had made them eat, drink, labor, and suffer, so God should in his judgment treat them.