Delta Vs. Core XY, Eliminating Vertical Artifacts, Selling Your Designs and MORE!!

This Episodes Questions:

Good Morning/afternoon/evening JJ, Nathan, and of course, Guy! I hope that you are all doing well and Nathan hasn't burned down down his studio yet. Love the podcast and all the content each of you are making. The different perspectives is really interesting to see and hear from you three.
My question is pretty simple. With all the hype about CoreXY machines lately, and people wanting to print faster, why are there not more Delta Printers on the market? Nathan, you can hold your tongue and let JJ or Guy respond and then let your venom spew forth. LOL! Also, can you please explain the reason CoreXZ even exists? Thanks for all you three do and I look forward to hearing the answer on the podcast.
John D Strand, yes the guy in the jesters hat at MRRF.

I purchased a Creasee Skywalker sometime ago but have not had the opportunity to use it until now.I have read that Creasee no longer exists. Can I replace the proprietary operating system with Marlin. Can you please point me toward a resource for some assistance.Thanks so much.
David

Hey, guys!! Absolutely love the show and watching your channels on YouTube. My question is I have a modded Ender 3 Pro and I've been struggling with these vertical lines on my prints along the Y axis. I've come to find this is a common issue among 3d printers and its referred to as Vertical Fine Artifacts (VFA). I haven't seen to of found any fix for this and have tried multiple things. Like belt tension, adjusting the wheels, replacing stepper motor and pulleys. I'm hoping you guys can shed some light on this and know of a possible fix. Or even maybe some tips that can reduce the appearance of them. Thanks guys!
Kyle

I listened to Brendons question about correct hole size and remembered when I had the same problem about last year when I started designing things for myself, I found a very useful little chart from littlemachineshop(.)com that is the first result if you google "little machine shop tap chart". The link at the top of the page has a PDF that has almost all the needed bore and drill sizes for whatever type of hole is needed based on fastener size, in standard and metric.
Making holes in Fusion360 also includes the option of choosing the type of fastener and then choosing between a tapped or clearance hole, and a lot of other useful options (depth, counterbore, countersunk, etc.). 
I don't know if I am required to ask a question, so if I am here it is: I'm thinking about selling some of my models as kits and as STLs. What would the best platform for that me? Etsy? Cults? Squarespace?
Thanks for your time,
Chris Feeney