Limiting the number of keywords you can search for daily is disruptive. Unless you're doing SEO full time (in which case you'd be on a higher plan anyway) then you tend not to be able to do a little bit of keyword research every day — you carve out one or two days a week or month to do that work. Every time I hit the limit on Ahrefs it makes me (irrationally) want to abandon the product. I'm sure I won't but it's still needlessly annoying. A monthly or even weekly limit would make much more sense.