Poparide operates a service under carpooling regulations which helps recover costs when you're already driving from A to B. In most Canadian provinces, this is not considered a commercial activity and therefore is not taxable. Check here for the regulations in your province
However, if you are already claiming your driving costs as business expenses with the CRA, you could be "double-dipping", and we recommend checking with your accountant how to declare your Poparide contributions.
Please note that carpooling is different from the CRA's definition of "ridesharing", which regulates for-profit ride-hailing services like Uber and Lyft. For these ride-hailing services, you are required to collect GST/HST and declare your incomes, as they are considered commercial activity.