mastodon.social is one of the many independent Mastodon servers you can use to participate in the fediverse.
The original server operated by the Mastodon gGmbH non-profit

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The "New Outlook" demands that when adding your #Gmail account, you also give Microsoft a copy of all your Gmail email, contacts, and calendar data.

The "Learn More" link confirms:

"Syncing your account to the Microsoft Cloud means that a copy of your email, calendar, and contacts will be synchronized between your email provider and Microsoft data centers."

WOW.

Good time to switch to @thunderbird, folks!