One would want to use an external service, because... well... it's a service. You are paying for someone else to maintain the system and care about the uptime, scalability, security, etc. You surely do not imply that you would pay grove.io simply because you can't bring your own IRC server up, do you?
One would want to use an external service, because... well... it's a service. You are paying for someone else to maintain the system and care about the uptime, scalability, security, etc. You surely do not imply that you would pay grove.io simply because you can't bring your own IRC server up, do you?