Whatever the reasoning behind these suspensions, I think it's very rude and unprofessional to simply suspend accounts without giving some warnings and some time

Whatever the reasoning behind these suspensions, I think it's very rude and unprofessional to simply suspend accounts without giving some warnings and some time for a user to comply. Most of these popular online services, including the tech giants, seem to prefer this rude approach. Not having any reliable human support makes the problem worse. Since you can't provide human support, just give some days to comply and then suspend.