There is some kind of trust I have/had in cloud providers to be fair when it comes down to vendor lock-in. One of the things I expect a cloud provider to do is not suddenly increase prices and instead give their clients a reasonable period (a year would be perfect, but I think 6 months is a reasonable period) so they can change their usage to minimize their new costs according to the new pricing or transfer to another provider if the costs are too high.
But Google just proved that they don’t really care about their clients. If you made an app that heavily relied on the Google Maps API, and you spend $3K a month now, you just received a mail that your costs might be increasing to $60K a month and you might need to drop all your current projects/tasks to migrate the app to another service.