These are not normal account signups, they are signups to become an associate member (https://join.osmfoundation.org/) which can vote in foundation elections.
I wanted to like Hugo (especially with its ridiculous speed compared to Jekyll), but I found that any time I wanted to do something slightly unusual I had to spend far too long finding what template file name I was supposed to use, mostly by trial and error. With Jekyll I just specify the template name in the front matter.
I think the primary purpose is the notifications, not the blocking. Even if they browse to the page once, see the block and disable it, you'll still know.
If you're looking for a replacement font for your tagline on the homepage, Montserrat isn't too different at the heavier weights. Nice to see Laravel Spark in the wild though.
It's Google's special brand font so I doubt they license it. However it is served from the same domain as Google Fonts so it's an easy mistake to make.
This definitely seems like an interesting product, but if you're an anti-piracy company then maybe you shouldn't be using a pirated font. If you check the Product Sans CSS file you're including, you'll see there's a notice that the font is not open source.