Is it worth to buy bitcoin in 2019?

I would not say so, as its very unpredictible, but if you go for a very short term invenstment, it might be fine.

Just use it as a trading currency like we all do.
It's not worth to invest in anything long-term because it's really not possible to predict.

It might be a investment you should consider because the price has gone down a lot lately. It will most likely rise again in the future as cryptos get more and more popular.

If you will use it then yea, It is untraceable, If you wanna invest, no, find something else.

Sure. Now is time to buy Bitcoin. If someone have some spare PM me