How many is too many curse words and profanity in comics? (Patreon)

So it got me thinking, when I'll be making the comic for Pepper in the Sandbox, is there some sort of limit to how much cussing and swearing I can have? Many of the characters in in there will be saying "fuck," "shit," "bitch," etc. as an expression, directed toward other characters, and to the stuff happening around them. Pepper will definitely be doing this a lot. 

I plan to publish the series to KDP on Amazon as a publish-on-demand type of physical comic and wondering if any of you guys know how strict Amazon is on this topic. Or maybe even just comics as a whole. I wouldn't be thrilled to have to cut back on that aspect of the comic but I guess I'll have to see. Mostly, because I feel that it would lose a big part of who Pepper is and I generally would like to be as liberal as I can with the use of the dialogue in that area.

I'm a bit aware that there are ratings for this type of stuff so I'm also wondering, if I have a lot of cussing, does that immediately get rated as "mature." If I censor the profanity like "f*ck" or "sh*t," do I still have to mark it as mature? What if it's just "$#!+?" Is that just fine?

Hopefully, you guys can shed more light on this! If there are sites that I can go and read about the metrics of this stuff I would greatly appreciate it 😀

Or maybe I'm just overthinking this stuff and it's totally fine to cuss like a sailor and this type of shit doesn't matter 😝