I found the answer to that question. RKN has blocked access to the ip address 104.26.8.198 and because of this it is impossible to access the site through the browser. Packets are sent and receive a response. It is this ip address that is blocked and nothing can be done. 
What ip is it? itch.io is 45.33.107.166. When u try to enter blocked sites u get "ERR_CONNECTION_RESET" or "DNS_PROBE_FINISHED_NXDOMAIN". Trying to enter itch.io i get "ERR_CONNECTION_REFUSED". Also as u can see it is blocked since 2016. So why problem appears only now? U posted it just for hype?
Also it looks like this now:
No hype, if you just type in the command line ping www.itch.io and you will get the same address, but if you enter through https, the command line will not understand such an address, only through www. No argument, yes, the address is different if you search through https. I personally only get the “ERR_CONNECTION_REFUSED” message in the browser.