Well, pivot while you can...
I guess they can't complain about the success but it would have to feel at least a little bit demoralizing.
As far as I know the regular mode is not free to play.
I only tried it because it was a free alternative to PUBG
I just had the impression DOTA was made by some guy who wanted to make something like DOTA and Fortnite was made by some people who wanted to make some mix of L4D and Minecraft, but pivoted to doing something like PUBG instead.