How do I find websites in a niche that are using membership or LMS Plugins

Anewbist

I would like to find membership websites in particular niches there are using different plugins that is  out there  

MemberPress

aMember Pro.

LearnDash.

Teachable.

s2Member.

WooCommerce Memberships.

Restrict Content Pro.

Paid Memberships Pro.

How do you search what will be the footprint any advice appreciated

what tools does the job

thanks