mementomori.social has blocked the following instances:

430022.xyz for "Hate Speech / Harassment"
5273.me for "Hate Speech / Harassment"
5dollah.click for "Hate Speech / Harassment"
80percent.social for "Related to Nazis"
9kb.me for "Spam"
absolutelyproprietary.org for "Hate Speech / Harassment: admin almost exclusively posts racist memes."
activitypub.awakari.com for "Data harvesting"
adachi.party for "Hate Speech / Harassment: Admin goes on racist / queerphobic benders, full on slurs. See https://techhub.social/@Raccoon/111557367291226595"
alterracloud.com for "Hate Speech / Harassment: Block Evasion by Froth.Zone"
america.social for "Spam"
asbestos.cafe for "Explicit homophobia and racism from an operator, claiming it's the policy of the instance. "
ating.pres for "Pedophilia / Lolicon: Known Pedophile Instance"
awakari.com for "Data harvesting"
bae.st for "Slurs, trolls, discrimination"
baraag.net with unspecified reason
beefyboys.win for "National socialism."
bestgore.fun for "Hate Speech / Harassment"
besties.com for "Spam"
boks.moe for "Hate Speech / Harassment: Old Instance, defunct"
(the list has been truncated to the first 20 entries)