We as a society need to figure out how to get people to stop using gmail.
Just like other anti-spam measures, non-spammers will get caught up in this. But a reasonable solution starts with acknowledging the issue is real: people figured out how to get calendar bookings on my calendar w/o my approval.
Can always file an antitrust complaint as well:
US: https://www.ftc.gov/enforcement/report-antitrust-violation
EU: https://competition-policy.ec.europa.eu/antitrust/procedures...