mastodon.design has blocked the following instances:

10minutepleroma.com for "Spam"
430022.xyz for "Hate Speech / Harassment"
5273.me for "Hate Speech / Harassment"
5dollah.click for "Hate Speech / Harassment"
9kb.me for "Spam"
9yo.punipoka.pink for "iftas:csam"
a.sc for "Hate speech"
absolutelyproprietary.org for "Hate Speech / Harassment: admin almost exclusively posts racist memes."
activitypub-troll.cf for "Spam"
activitypub.actor for "IFTAS:Service Abuse"
adachi.party for "Hate Speech / Harassment: Admin goes on racist / queerphobic benders, full on slurs. See https://techhub.social/@Raccoon/111557367291226595"
aethy.com for "IFTAS:CSE/CSAM"
albin.social with unspecified reason
alterracloud.com for "Hate Speech / Harassment: Block Evasion by Froth.Zone"
andrew.xyz for "Spam, CSAM"
anime.website with unspecified reason
annihilation.social for "Hate Speech / Harassment"
asbestos.cafe for "Hate Speech / Harassment"
ating.pres for "Pedophilia / Lolicon: Known Pedophile Instance"
(the list has been truncated to the first 20 entries)