As I recall, the requirement to claim the drop bonus was to have a minimum total wager of $10,000 for a $5-$10 bonus. For a $25 bonus, a minimum total wager of around $50,000 was required.
But I doubt things will change, and perhaps Stake will increase the minimum wagering requirements. 😆
Minimum wagering requirements will vary depending on the bonus value. Currently, most bonuses are $3 with a $12,000 wagering requirement. Slightly higher bonus values will require higher minimum wagering requirements.
They drop more bonuses, but the value and minimum requirements do increase.