Where did you read that? it would be nice to know the source to see if someone here can confirm the info.
That's the thing - I don't even think that I read it - I think it was something I heard on the radio or in a tech podcast (no idea which one as I listen to several and didn't keep track of listened/deleted episodes). It was one of those situations where I wasn't listening closely and just had it playing in the background as background noise. Sorry for my inattentiveness!
Went through their social media and I don't see them mentioning that they will remove their "free plan" from their API. In fact one of their recent post was advertising and welcoming people to use their free plan to try out their API. You were probably misinformed or it was me that missed out. Anyways, try googling and you might find your answer. Or use other sites the users provided above.