Apologies if this belongs in the noobie section, but...
Is there any way of earning TC outside of multiplayer? Or am I stuck grinding and getting my bum whooped in MP, which is something I have absolutely no interest in at all... nor do I have any interest in signing up for those freebie surveys or websites that drop adware onto your computer. I just want to enjoy ripping uke apart, look badass in the process, and upload the videos... If not, is there any way around the TC system so I can just enjoy this as a single player game?

You can earn tc by marketing, and making your own textures or shops with items.
Also you can participate in events if you are good at replay making, or making art.
It will probably be hard to win an event if many talented people participate.
Most likely the easiest thing to do is make textures and sell them.
Or you can buy tc or ToriBoosters.