risk is subjective because its not a yes or no
everything has risks. its just how much

EG if you bought bitcoin at the 2017 $20k and you NEEDED break even/profit by mid 2018 then yea mega risk buying that ATH.
but if you dont need to cash out for a halving cycle then the risk is far less

basically if you buy low sell high the risk is low
if you buy high sell higher the risk is higher. but it all depends on patience in the end

so for me (hoarding since 2012 and have no desire to cash out any time soon) i dont feel im at risk at all. even though there is a small chance(risk) that devs completely break bitcoin one day