i just cfw my old 2ds with boot9strap and i was wondering now that if you use freeshop you will get banned
this wont work . . . or more accurately freeshop does not work, nintendo fix the shop verification process in such a way that freeshop is dead forever
if i was to install a cia game like smash bros will i get banned for that?
not at all . . . things that can get you banned are
1. trying to use the eshop to re-download games you did not buy
2. cheating online
3. playing a game before it comes out
4. using homebrew in a way that nintendo can detect . . .let me explain, your 3ds reports to nintendo the app you currently have open whenever you are connected to the internet, if its a homebrew app you installed as a .cia via fbi nintendo can tell, but if its a homebrew app you never "installed" and instead use the .3dsx version via rosalina nintendo cant tell. in addition to reporting your currently open app if you have no app open when you connect to the internet it will report the last app you did have open ... so number 4 is really a two part
4.1. use 3dsx versions whenever possible
4.2. run .cia homebrew offline and run a official(licensed) app before connecting to the internet