bitcoin price (logged)
Then please explain why your "bitcoin price (logged)" does not look anywhere similar (not even remotely) like any other bitcoin price log chart?
It actually does.
No:

To linearize things (make them 'straight' for analysis) that have points below and above 1, you add 1 to your log (i.e. log x+1). It looks like they haven't done that here. Simples?