Trello: Non-admin users will be a paid feature
help.trello.com
help.trello.com
In 3 weeks we’ll begin to roll out a change that affects your Trello team by expanding the permissions of free team members.
Starting on April 30, 2020, all members of free teams will have admin permissions. That means that all members of the team will now be able to:
* Add or remove team members
* Change team-level privacy settings
* Upgrade the team
If your team requires more granular permissions, such as controlling who is and isn't an admin, changing permissions is available as a Trello Business Class feature.
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The above is the contents of the mail I got from Trello and the link is copy-pasted from the message. If someone has a link with a better description of the change, please post it here and wait for the mods to change the submission link.