Substack-like subscriber plugin?

I’m wondering if anyone has a good idea for a plugin that collects subscribers similar to how it works on Substack?

What I mean is, it's common that when I visit a Substack blog, a prompt pops up (while the background darkens), asking if you want to subscribe or continue reading. It gives the impression that you don't really have an option but to subscribe to access the content.

Currently, I use content upgrades, lead magnets, popups, etc. But I suspect their method of collecting subscribers might be more effective.

However, I can’t seem to find anyone who has done something similar for WordPress. Any ideas? Thanks in advance!