If you are very desperate, there is one way you can pirate games without getting banned, but it's a huge hassle. Also, I'm not responsible if you do get banned, or if you break your Switch in the process.
Before you do ANYTHING you must make a full backup of your NAND. Afterwards, delete your wireless connections and turn on airplane mode. You want to make sure you don't go online while you have pirated games installed.
Next, swap microSD cards. You want one card for all of your legit stuff, and another card for all of your illegitimate stuff.
Now, use whatever method you want to load backups (SX OS, LayeredFS, Hekate/ReiNX with sigpatches, etc.) Play and have fun.
When you want to play online again, use Checkpoint or a similar homebrew and backup all your saves (otherwise you will lose them!)
Restore your NAND backup to your Switch, and switch back to the microSD card you're using for legit purposes.
Congratulations, now your console is back to stock, and there's really know way (that we know of, anyway) that Nintendo can tell you were using pirated games on it. Feel free to play online with it.
If you want to play your pirated games again, you have to start back at the beginning. Make a new NAND backup (to retain savedata in your legit games, and for consistency in telemetry data). Disable wireless. Swap your SD card. You can use Checkpoint to restore your saves for your illegitimate content.
Wash, rinse, repeat. If this sounds like a big pain in the ass just to be able to play some pirated games, it is. Emunand could potentially make things much easier.
And just to clarify, there is NO known way of playing pirated titles online, at least not without a very high ban risk that cannot be undone. Once you are banned, nothing can get you unbanned!
