At first glance, this change in their strategy may seem bit awkward. However we need to understand that their way of operating business has been totally disrupted by the changes from govt and banks. Banks have mostly stopped/closed accounts which were active in the crypto-trade. This has largely affected the crypto-trade from which zebpay might have been able to earn their profits. Now that part of profit earning gone, they might had to look for new source of raising income to sustain the business.
On the other hand, somebody has mentioned about the monthly fees (account maintenance fees) might not be charged if some trade is done during that month. So their is a hope for better days. Once this kick-starts properly then other companies will also follow the suit.