Why does Rostelecom block ESNI traffic?

Question

Domain Name System

Recently, it has become specifically pissed off that Rostelecom is blocking ESNI traffic for some fig. I don’t know where else to turn to state this as publicly as possible. The essence of the problem is that when ESNI is enabled in FireFox, then sites through Rostelecom do not open, just some, for example, https://www.pcgamingwiki.com and https://downdetector.ru from https://maxedtech.com , not to mention already just about the pictures on the same https://www.deviantart.com ...
Why actually do that at all? Other providers do not have such a problem, but what is most interesting, when Rostelecom had a problem logging into the Personal Account with ESNI turned on, they stopped blocking this traffic for a while after a complaint, and then began to crush it again. And no, everything is in order with the network \ Internet \ dns settings, the problem is in Rostelecom, but on the same Tele2, which belongs to them, everything opens fine. Support in the chat and call center only gives parrot excuses in style, we don’t have any blockages, and in general there are problems supposedly with your equipment ... This problem has been around for about a year now, if not more.

UPD: As of today, 10/16/2020, somehow by magic they stopped blocking ESNI traffic. True sites open every other time ...
UPD2: And after a few hours, the sites stopped opening again...
UPD3: An interesting moment turned out, sites with ESNI support open in the same tab, if any other site was previously opened in it via HTTPS without ESNI, but in a new one there is no tab ...
UPD4: After Tele2's network crashes in some regions, somehow they got exactly the same blocking of sites with esni support and the above sites for examples do not open in exactly the same way ...

Answer 1

After weeks of waiting and sending dumps from WireShark, they called from support and answered that their filtering system prohibits ESNI, and they do not plan changes, although there is no law on this at all, which is still in the draft ... So it's time to leave RTK . PS There was no talk at all about bypassing blocking and switching to allegedly prohibited sites, but innocent sites suffered as a result ...