frequent DNS domain queries about "LE"

Actually i had a question to the Tasmota community but no one could answer it because "the Wifi stuff comes from the Arduino core, so ask there".

So here I am.

My devices frequently send DNS domain A record queries for the domain name "LE". This of course results in NXDOMAIN answers.

To put this in perspective: given the relatively high number of devices I am operating the amount of those DNS queries constitutes a bit less than 50% of all DNS queries sent to external resolvers.

Has anyone else observed this behavior?

For what purpose are these DNS queries generated?