At the beginning of this week the theory that Animal Crossing: New Horizons could have payment content integrated into the app, because this was indicated by a description of the ESRB
Nintendo seems to have taken action and has updated its website with a new rating of the ESRB
The good news is that now we can rest easy knowing that Animal Crossing: New Horizons It will not have any additional payment content, and will remain so until the company indicates otherwise.