Let me give some context about pass DDOSing I have seen. Way back a couple of years the japan equal to the (USA MIAA, RIAA mafia groups). Started to make a big stink in Japan. They were going after anybody and everybody. The caveat was only Japan based groups were being taken down.
Skip ahead a couple of weeks, and all of a sudden Anime groups not based in Japan were being attacked. The Horriblesubs "HS" group was knocked off a couple of days. The torrent tracker affiliated with HS was totally busted by DDOS attack, never came back. A new tracker was created. The HS group was and has been under attack since then. Popular anime Durarara and monster musume no iru nichijou was hard to get at the time. As well as many others.
Let's fast forward to a time a couple of months pass. Mangadex "MD" became very popular, to say at least in the top ten manga category. MD is now under attack, off and on, light and heavy. This all came to a real head after the latest chapter of monster musume no iru nichijou was posted on MD. Later that same day the attack intensified and didn't stop.
Take from this:
There are some groups, individuals and corporations that don't like anime and manga posting forums.
Nothing is going to change that.
Want to get an idea how wide spread the hate is. Go to google translate and enter Japanese terms. The translations have been corrupted.