Red alerts in Apple Calendar: 'Last warning all your photos will be removed' and 'Hidden risks could be in your iCloud setup'

I think my apple Calendar has spammed- Red alerts that have gone through my entire calendar. “last warning all your photos will be removed” OR “hidden risks could be in your icloud” Anyone else experience this? I don’t think it can be Apple because they invitee isn’t Apple

[Re-Titled by Moderator]

Original Title: I think my Calendar has spammed by alert on it that has gone through my entire calendar. "last warning all your photos will be removed". or "hidden risks could be in your icloud setup" Anyone else experience this?