It goes up of course. Nothing's for free. Don't expect DigitalOcean level of pricing, the premise of cloud is on efficiency and scale, not necessarily being the cheapest raw computing provider when compared to traditional hosting. In other words it increases the elasticity of computation, but the price per unit of computation goes up. (Of course there are cost-savings like ops, security, uptime etc. But if you are talking about one-off side projects or something ML-related then the raw compute/bandwidth costs far outweighs everything else.) For PaaS the free tier is subsidized by your enterprise and other paying customers.