Cross platform is old school. You can send email between providers, call people on different phones, and access websites without knowing what kind of server the

Cross platform is old school. You can send email between providers, call people on different phones, and access websites without knowing what kind of server they're on, but can you place a video call from Skype to Google Duo? Send messages from Slack to Discord? Tweet something using your Microsoft account? The open web is dead, it's all big companies' silos now.