As you asked before, here is this:
My curiosity was peaked on how far you can get away with having NSP content installed while online. This might just be common knowledge and I'm just ignorant enough to not google it, but I did it anyway.
DISCLAIMER: I did this on 4 "broken yet playable" Switch models I bought from Ebay(e.i. broken screen so only docked, unable to accept joycons so only wired controller, etc.) so your mileage may vary. I did not restore any of the firmwares on the Switch consoles. When a console was banned, I went to the next one. So, do not try any of this if you have even a shred of doubt you may get banned.
Games Used: Fortnite, Splatoon 2 Physical, and Dead Cells NSP.
First attempt: Booted into CFW with no airplane mode, Installing NSP through Tinfoil, played NSP, Fortnite, Unable to start application. Loss to Eshop. Ban.
Second Attempt: Airplane mode while in CFW, installing NSP, then switching airplane mode off, played Fortnite, played NSP, played Splatoon 2. Error. Can still access Eshop, online gameplay is inhibited. I considered this a "ban"
Third Attempt: Airplane mode while in CFW, installed NSP, played Splatoon 2, airplane mode off, played NSP, Played Fortnite, then Splatoon 2 again. Error. "Ban."
Fourth Attempt: Airplane Mode CFW, Install NSP, Fortnite, Splatoon 2, NSP, airplane mode off, Splatoon 2, Fortnite, Console Off, CFW Airplane mode on, NSP, Airplane off, Splatoon 2, Fortnite, left Switch on to see if autoban after some time.
I've started this Monday, August 6th and the fourth Switch has yet to be banned as long as the Tinfoil installed game is run on Airplane Mode. I have yet to see if Switch is banned after some time with a Tinfoil installed NSP. If you're afraid to get banned I would recommend an exclusive Airplane Mode only Switch consoles. I did this as an experiment to see what I could get away with as I like playing online with my Switch.
Edit: 4th Switch is now banned. Woke up this morning and started playing Splatoon 2 and downloaded Paladins to use more varied games to mess around with and received an error code 2124-4007. Ban.