Why is ping not working?

Question

Ping

The server does not ping to some hosts and I don't know why.
For example, ixbt.com and cyberforum.ru do not work. But habr.com works.

ping ixbt.com -c 1 -W 2
PING ixbt.com (91.208.42.67) 56(84) bytes of data.

--- ixbt.com ping statistics ---
1 packets transmitted, 0 received, 100% packet loss, time 0ms

ping cyberforum.ru -c 1 -W 2
PING cyberforum.ru (185.112.80.14) 56(84) bytes of data.

--- cyberforum.ru ping statistics ---
1 packets transmitted, 0 received, 100% packet loss, time 0ms

ping habr.com -c 1 -W 2
PING habr.com (178.248.237.68) 56(84) bytes of data.
64 bytes from 178.248.237.68 (178.248.237.68): icmp_seq=1 ttl=54 time=13.9 ms

--- habr.com ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 13.915/13.915/13.915/0.000 ms

There is a route to ixbt.com

spoiler

1  _gateway (144.217.160.1)  0.421 ms  0.458 ms  0.450 ms
 2  192.168.143.254 (192.168.143.254)  0.423 ms  0.404 ms  0.395 ms
 3  149.56.63.190 (149.56.63.190)  0.382 ms  0.365 ms  0.355 ms
 4  10.98.242.189 (10.98.242.189)  0.325 ms  0.311 ms 10.98.242.141 (10.98.242.141)  0.286 ms
 5  be120.bhs-d2-a75.qc.ca (198.27.73.60)  0.285 ms  0.284 ms be121.bhs-d1-a75.qc.ca (178.32.135.216)  0.251 ms
 6  10.95.81.10 (10.95.81.10)  2.168 ms 10.95.81.8 (10.95.81.8)  1.896 ms 10.95.81.10 (10.95.81.10)  1.120 ms
 7  be100-1319.nwk-1-a9.nj.us (198.27.73.205)  8.433 ms  8.444 ms  8.126 ms
 8  be104.lon-drch-sbb1-nc5.uk.eu (192.99.146.132)  76.978 ms lon-thw-sbb1-nc5.uk.eu (192.99.146.126)  80.962 ms  79.363 ms
 9  be101.rbx-g2-nc5.fr.eu (213.251.130.102)  84.856 ms  92.518 ms be101.rbx-g1-nc5.fr.eu (94.23.122.144)  81.974 ms
10  fra-fr5-sbb1-nc5.de.eu (178.33.100.159)  90.395 ms be104.fra-fr5-sbb2-nc5.de.eu (94.23.122.241)  89.950 ms  86.761 ms
11  10.200.0.6 (10.200.0.6)  92.590 ms 10.200.0.2 (10.200.0.2)  91.562 ms  90.103 ms
12  * * *
13  a197-cr04-be6.77.msk.mts-internet.net (212.188.2.190)  120.833 ms  121.790 ms  123.645 ms
14  a433-cr02-be2.77.msk.mts-internet.net (212.188.28.150)  123.275 ms *  124.430 ms
15  m9-cr02-be7.77.msk.mts-internet.net (195.34.53.204)  123.954 ms  124.432 ms  120.118 ms
16  Filanco-m9.msk.mts-internet.net (195.34.38.134)  134.696 ms  136.108 ms  134.447 ms
17  folga-gw.datahouse.ru (89.188.100.118)  124.279 ms  124.240 ms  123.503 ms
18  * * *
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To compare the route from another server where ping to ixbt.com works.

spoiler

1  10.19.82.88 (10.19.82.88)  0.460 ms  0.474 ms  0.469 ms
 2  10.6.137.1 (10.6.137.1)  0.793 ms  1.011 ms  0.988 ms
 3  * * *
 4  10.6.30.124 (10.6.30.124)  0.628 ms 10.6.30.118 (10.6.30.118)  0.727 ms 10.6.30.122 (10.6.30.122)  0.732 ms
 5  148-32-15-51.rev.cloud.scaleway.com (51.15.32.148)  0.876 ms 142-32-15-51.rev.cloud.scaleway.com (51.15.32.142)  0.812 ms 158-32-15-51.rev.cloud.scaleway.com (51.15.32.158)  1.068 ms
 6  51.158.8.24 (51.158.8.24)  1.298 ms 51.158.8.171 (51.158.8.171)  0.996 ms 51.158.8.24 (51.158.8.24)  1.074 ms
 7  51.158.140.129 (51.158.140.129)  0.763 ms  1.042 ms  0.735 ms
 8  62.141.99.254 (62.141.99.254)  0.925 ms  1.015 ms  1.021 ms
 9  pe26.Moscow.gldn.net (79.104.225.59)  41.741 ms  41.665 ms  43.019 ms
10  Filanco-gw.Moscow.gldn.net (194.186.0.250)  42.762 ms  43.637 ms  44.194 ms
11  folga-gw.datahouse.ru (89.188.100.118)  44.019 ms  43.955 ms  41.806 ms
12  * * *
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Answer 1

Because the administrator of any host on the path to the target address, and at that address itself, can disable ping traversal or response.