Yes, there are often times that customers migrate from other cloud storage providers and that will show up as a very large burst of ingress. That being said, we have taken steps to limit free tier abuse. See ‘Why are you changing the free tier limit for new accounts?’.
For timing on when the data will be removed, see ‘Q: How will Storj minimize impacts to Storj Node Operators?’ for how we plan on minimizing the impacts to node operators on the payout changes and removal of any data.