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Hey @Maximilianist - welcome to the Community!
All boards created in Trello need to sit in a workspace. Upgrading a Workspace is the primary way of upgrading to a paid plan in Trello, and free workspaces can only have a maximum of ten boards open at a time. When you upgrade to Standard or Premium, all users that are considered billable within your workspace will go towards your monthly or annual bill.
Billable users in Standard and Premium are the following:
Single-board guests - users that have been added to one board in the workspace - are not considered billable users. You can read more about how billing works with Standard and Premium here: https://help.trello.com/article/855-how-billing-works-with-trello-business-class
So in answer to your question, on a Standard subscription, you have to pay for every workspace member in your Standard workspace as well as every multi-board guest.