Bitcoin cycles: Did everybody know about 4 year cycles in 2017 and 2021?

Read another prediction about how Bitcoin will go to a certain number ( $150k-$1 million) by the end of this cycle before going down. My question is for people who have been around a while were people talking as predictably about dip after spike in 2017 and 2021? This is only 4th cycle since inception, so when did it become the rule? 2018, 2022? Can’t imagine it was in 2013-2014 that people knew already.