I'm happily on my 2nd OPNsense business license on Deciso embedded Ryzen-based hardware with 10 GigE optical links. Even takes care of PKI and has 2FA. I'm happy and I don't have to worry about massive, arbitrary license changes or big corporate enshitification.
Moved to OpenWRT a few years ago and been quite happy since.
This seems to indicate that nearly nobody was using it, even counting the illicit activities of the multiple appliance vendors.
If I have a modest lab automation with solid bracketing of fw release versions on some network scenarios, I could easily account for thousands of on-install telemetry entries per week.
I can imagine Hetzner alone would account for thousands upon thousands of installs.
Just based on their phrasing, I doubt there will be a massive influx to opnSense.
I'm pretty happy with the experience and the end result.