When you use Vimeo as your streaming source, Vimeo's "fair use" bandwidth rules apply:
In 99% of all users, Vimeo does not charge extra for your bandwidth usage.
If your bandwidth usage reaches unusually high levels, the Vimeo team might reach out to you to transition to a custom plan.
You can read more details on Vimeo's bandwidth help article: https://vimeo.zendesk.com/hc/en-us/articles/360037761072-Bandwidth-on-Vimeo-