Why not highlight your free plan?
Most companies highlight their middle paid plan saying it is "most popular".
First thing, yeah, sure it is your most popular plan.
But more importantly, most visitors will not convert to your paid plans right away.
So why not try and capture as many devs as possible on the free plan?
If they like your dev tool there are many things you can do to convert some of them to paid plans.
But if they leave that pricing page and go with some other free tool, you are not converting anyone.
@CircleCI highlights free and they are in the mature, competitive market of CI CD tools.
Idk, it really does make a lot of sense to me.
If people need more advanced features they will choose higher plans anyway.
But if they want to get things started with the basic plans they will choose free or go elsewhere.
I'd rather have them choose free than none.