[Multi-Domains] WPMU DEV membership

Hello,
I think WPMU DEV is amazing and very helpful! However, I have a few questions. First, after developing a client's website, I'd like to charge the client a monthly fee to maintain their website and plugins updated, will I be able to disable the WPMU plugins if the client fails to pay the monthly fee? Second, if the client decides to migrate their website to another hosting provider, what will happen with my WPMU plugins, will they be able to continue using the plugins with my license?
Thanks.