Why is there so little response (e.g. implementation in crypto libraries, programs...) after the end of the CAESAR competition? As far as I can see, there is no shift from AES-GCM to any of the CAESAR algorithms. The response to the Password Hashing Competition, for example, was greater, at least in my perception. Is there a reason for that?
CAESAR competition did not result in any standard.
I think it is because AES-GCM is already widely adopted (with hardware support, although some CAESAR algorithms also use AES) and CAESAR didn't bring anything significantly new. For example OCB was known before, but it is not widely adopted because it is patented (seems like patents have expired now). I guess CAESAR was too late for industry. There is no compelling reason to shift from AES-GCM.
Possibly Ascon and ACORN are being adopted, but we don't know as they are embedded in small devices. Ascon is also one of NIST lightweight finalists.
Password Hashing Competition did bring more as we only had PBKDF, bcrypt, scrypt.