That page is really nice!
The concern is more for terms like $F (i.e. Ford), so for example “$F” works most of the time, except “$F.”, “$F?”, and “$F!”, moreover, using terms like “F” will lead to a lot of garbage. What’s the best solution for this problem? I am most interested in catching symbols with the leading “$”, but I will miss all instances that start with a leading dollar sign and end with punctuation, which will happen at the end of a sentence. Perhaps the best solution is to just use “F” and then do some post-processing? But then I would most likely run into your daily 1% max limit. 