@jcmarvillet
My advice, don't rely on a company to maintain something for us (Ubuntu Touch users).
What I would do:
manually export my calendar from google
import it into a nexcloud account
then sync nextcloud with UT
Nextcloud will remain and if you're using service by some company and not your own instance then don't forget to backup your data
Nextcloud will be maintained as Google may decide to block any third party... They are already pushing in this direction.