Please do ask for login/signup up front instead of tricking people into filling out forms, and then be met with a login/signup form right before actual submission. I know it's a known dark UX trick to increase user signups, but it feels incredible hostile.

Not only do I feel like you wasted my time, but you probably still kept the data, and then just didn't make it visible to the user who filled it out, since there was some async step in the middle somewhere. Sadly, this is the only thing I could focus on after hitting it, rather than giving you feedback on the project/product itself. But I'm not feeling very helpful anymore.