I didn't notice at first but it's one of those "blog post ads", concluding with "it's time".

Time for what? To click the "open app" button? Okay, so I clicked.

It doesn't open app. A button labelled "open app" should do what's on the tin. Instead it prompts for sign-up with terms and conditions warnings. I'm out.

Just open the app without sign-in! Why not? Too hard? Too scary? You can haggle for sign-up later. Let's see what you have right now, under the button labelled with a promise that I expect you to keep. Lying to me on page one is not a good start.

Here's an example of a web app that does it right. The button "start using Photopea" isn't a lie: https://www.photopea.com/