There are various cost effective (and secure) alternative payment solutions for incentives.
Amazon: Incentives can be as low as £1 (good for tasks in a long term community) and you can pay up to 999 people at the same time by uploading a spreadsheet. The major downside for me is that it only works easily in the UK with GBP although can be used in other countries by creating accounts on the local sites & ordering in local currency – it doesn’t work everywhere but certainly done USA, France, Spain, Italy and maybe some other European countries
https://www.theirperfectgift.co.uk/ – essentially a pre-paid Mastercard and has the advantage of working internationally.
Voucher Express – emailable gift vouchers – https://www.voucherexpress.co.uk/content/e-vouchers-from-voucher-express.aspx