Can you please share if on the free version that select individuals can be on multiple boards or workspaces for free?
I've been able to collaborate with another colleague on two different boards and this seems to be the case but we have further projects upcoming and will need members on various boards across workspaces.
Thank you for clarifying!
Thanks for reaching us.
About multiple boards, Trello accounts don't have a workspace limit, so you can create as many as you need. However, you have a limit of 10 boards on each free workspace. In free workspaces, you won't be billed if you invite a user to multiple boards. you can take a further look at this link: https://support.atlassian.com/trello/docs/multi-board-guests/
By last, you don't have any limit about how many boards/workspaces you're a member and the board/workspace member limits are high. So you will hardly have problems with this.
I hope this information helps, let me know if you have any other questions and I'll be happy to help!