My take is explained here: https://steemit.com/bitcoin/@wekkel/bitcoin-in-a-bubble-no-way

Posting a non-logarithmic chart does give the impression of a bubble but it is probably not the best way to illustrate Bitcoin's growth. The growth had an exponential factor and that shows as a major spike on a regular chart. A logarithmic chart gives a better view of what's happening.

Take a look at the third graph in this post. First comment is that the current price action compared to the two 2013 bubbles is still a walk in the park. It is nothing.

Second, only when (not if but when because infinite growth does not exist) the main trend line shown on that chart is breached, it is time to start worrying.