Why to scientists publish demos on YouTube and on their WordPress sites?

We found such examples from Arnaud Delorme about Muse LSL and Mind Monitor, Alexandre Barchant about Muse 2 LSL, Irene Vigué-Guix about OpenBCI LSL, Scott Harden about Sound Card ECG, ‪Talha Iqbal‬ and Peter Charlton about R-R peaks, respiratory rate, PPG sensors. Such reviews can also be found in the journal of the MEDITATION RESEARCH …