A plug here, but we built an app around tracking Firebase usage and costs because there it a worry about getting a big monthly bill. Check it out at https://www.firerun.io
First off, thank you for building and sharing with the community. I have built a few landing pages with React and always end up regretting because you always need a React developer to maintain. I think best to build the landing pages (about, homepage, faq, etc) in something a non tech person can use like Wordpress or at least Hugo (markdown). You don’t need to bring in a React developer when you want to add a new marketing section to the homepage.
I am working on a way to better track and gain transparency into your Firebase costs. The goal is prevent you from getting a surprise bill at the end of the month. I’ve started out with a daily and month end reports of your usage and costs. I’ve even been able to give cost metrics that aren’t in the Firebase console. Eventually will have a dashboard so you can dive into your historical costs and setup custom alert that are more fine grained than what google allows.