I keep a separate capitalone cc for all "subscriptions" and always keep it disabled, so that no charges will ever go through. just enable it back for 10 second

I keep a separate capitalone cc for all "subscriptions" and always keep it disabled, so that no charges will ever go through. just enable it back for 10 seconds when signing up for service and disable it back. so far it kept me safe from annoying services asking for cc and their unexpected charges