Hostinger own 000webhost.
Hostinger provide a premium hosting service to paying clients.
As a side they provide free hosting on a learning platform for mostly educational needs.
The two services are 100% separate and operate differently.
i.e. Premium is as it suggests - premium - no limits, 24/7 support and on site staff and technical support all the time, where as 000webhost is just beta basically and maintained as and when needed and there may be issues with 000webhost where as Hostinger is stable and doesn’t change / face abusive users as the service isn’t free the abusive users don’t sign up.