Thank you for the feedback. Changing the default setting is under review by the feature team, and your feedback is very useful as they are evaluating.
An error occurred while saving the commentLiam O'Mahony commented
Teams is of no use at all if you add people to a team and they get no notification of activity by default. It's supposed to be a COLLABORATION tool. Come on MS sort this very quickly please. For a product like this you must opt out of notifications not have to opt in.