@seime once pointed me to Google trends. Looks like intensity of search calls related to openHAB is at the same level as in 2014:
[source: google trends openhab]
I intentionally do not compare it to anything else, in order to see scale of change for openHAB itself. Clearly there is some up around release dates, and downs once everything is set. It is evident that trend line went down from its peak in 2018. Lowest points in 2021, 2022 and 2023 are smaller then in preceding year.
It could be that our software is so good that nobody needs to search it, but after putting other solutions in the graph it is clear that interest is fading away from openHAB towards them.
The end score is 3:83 (27x times) for HA.