Its a pretty basic investment case.

Auto industry is going to go all or majority EV over the next couple of years.

Tesla is mile, miles ahead of every other "auto maker" (tesla is really a tech company that happens to make cars though), the argument that VW, Ford, Toyota will catch up is hilarious. You can do this research for yourself - just go test drive a Tesla. Eg, Porsche have been working on an EV supercar for years... it comes out.. its slower than a model 3, has less range, and costs about twice as much!

So therefore, just on their auto products, they will be massive, possibly a trillion dollar revenue company.
Not to mention their other products and stuff they can do, batteries, the self driving tech - which is all done on data. Nearest competitor has 20 million miles of data for self driving tech... Tesla has 3 billion.

Easiest case ever to put money in, the potential upside is huge. I went in big at $260, then again when it dropped to $200. Pretty happy right now. Was easy decision after reading Elon's book and seeing the drive and commitment he had to put EVERYTHING into this company, and then test driving one at the same time.