First, thank you all for your answers, it’s very interesting.
TSLA 
Yes, I think they will grow as big as other manufacturers but combined, not sure for long term. I think, in 5-10 years, concurrence will be there with good products.
So, i’ve invested because I think they can be more profitable but I will sell them later or sooner if the hype is going down. It was more a low-term investment.
Imagine if I have 1’000’000 (take big directly ;-)) :
I would invest in max 5 stocks. Apple (love products, think they can grow lot more etc, dividend is not bad etc.). VWRL and 3 more but dont’know now which ones.
Just buy VWRL :
I’ve read this but, I must admit, I prefere to take a little bit more risk to have better results. I explain :
As I am checking often the money on my trading account, I prefer taking risk with, for example, Apple for a mid-long terme instead of vwrl but, as I said previously,vwrl is on my short list.