perhaps its a new kind of market fit validation - you're only allowed to spin up a micro instance and if it gets overwhelmed, you've validated your idea!
Sorry for your bad experience. I did launch the service with 2 linode-2gb and 2 linode-1gb, and yes it didn't fit with the situation. I've increased the resources now. I hope that it will be a balance between my budget and server performance. Thanks for your message.