Billing for users who have access to one board

Firstly, the account area of Miro is one of the most confusing I’ve ever used - so this has probably been asked numerous times already, so apologies for that!

I am a freelance consultant who works for numerous clients. I have created a board, and shared this board (comment only) to 8 other email addresses. 

When I log into my account section, under ‘Active users’, I just see myself - but there is also a notification which says “1 member below is in the team. And 8 other users have access to some boards in this team.”

My questions are:

Will I be billed for these 8 other people? They have comment only rights…
And, where can I check to see this information. Would they appear as team members if I was to be billed?

Thanks!