The new AWS signup experience now lets devs build until their credits run out and auto-shuts off resources to avoid any overspend. Also there's an option after credits run out to set a monthly spend cap where resources pause automatically when this spend cap is reached! More details in this blog and also a beginner project idea for new devs:
https://builder.aws.com/content/3K40wU1kLaw4K1mIPkvVxKkx7mV/...