It is advised that you do but it isn't required.
The major benefit of renewing your submission to data aggregators is that your data retains it's 'trusted' status within aggregator feeds to 3rd party sites. This means that 3rd party sites see this data as being more 'official' and are less likely to overwrite it with data scraper/imported from other sources.
Your data won't get deleted from the 3rd parties sites because they buy it from the aggregators so it's useful to them.
However it does cost to renew your submission to aggregators. The renewal cost is the same as for initial submission/update.