There's some weird nudging psychology that says when when people see an expensive and free option, the mid-tier seems even more appealing, which makes it easier

There's some weird nudging psychology that says when when people see an expensive and free option, the mid-tier seems even more appealing, which makes it easier to get them paying. Honestly, I wouldn't worry about it. If your tool is useful to people, I think your query limit on the free-tier will be enough.