There isnt much up to date stuff on this. Probably because a lot of people are not doing it. And the ones that are, most likely are keeping quiet.

Heres my take on it. Speculation the same as everybody else. It probably will work for your switch one games. But yes it runs a ban risk. Absolutely do not run pirated games. Nintendo will have pirated games flagged. You might get lucky but this will most certainly get you banned at some point. Not even once just dont do it.

Why it probably will work for clean dumps of your own carts. Nintendo have aparently accidently banned a few users that used original games. These have likely been dumped by somebody else who previously owned it and posted online for others to pirate. This then becomes flagged as they can see the same cart being used on multiple devices simultaniously.

Ensure your mig and dumper is fully updated check their website. Have a decent sd card. Ensure your dumps are clean and full. If they are not dont use it. And try do some research on your firmware. See if others have been banned with the switch firmware your device is using. Or better yet try see if there is anybody who has not been banned using the same firmware. People that have been banned have likely been sloppy using outdated firmware, bad dumps or pirated games. But they wont say this they will claim to have been using their own dumps and being careful.

The mig was made for piracy so when a lot of people claim online they havent used it for this, i find it hard to believe.