Not necessarily, a lot of people get trapped by using their ISP provided email address as their main address. If they subsequently change ISP it can be a nausea to disentangle yourself from your former provider. You have to change to new address, independent of the ISP, and then alter all your log-ins and account details. Rather than do this, many people stay where they are. Some ISPs even charge an ongoing fee to retain your ISP email address if you change to a different ISP.