Yeah… Notifications have multiple limits on different levels. Blynk limit is 100 messages per device per day (online/offline not included).
Google limit: you can’t send more than 10 push messages/second for 1 mobile device, you can send more than ~10k push messages per mobile device per day. Etc… Same with mail. I think in case your device sends more than 100 messages a day it does something wrong and you have to optimize it to send only really required / important massages.