This is definitely not exhaustive but I will add to this list when I can.
#1 – 51% Attack
Preston Pysch Interview with Jimmy Song. At 37 min 35 seconds, Jimmy explains the futility of the double spend attack. He also discusses a large re-org and the defence against it, where node operators can execute a command “disconnect block”. While it’s great this feature is available, I don’t know how to use it, and many others will not. Something for future awareness.
Andreas Antonopoulos explains the 51% Denial of Service attack and why it doesn’t work, and ultimately strengthens Bitcoin.
#2 – Quantum Computers
#3 – Ethereum?
Ethereum needs to be money first – Arman The Parman
The maths of Ethereum price – Arman The Parman
#4 – Wastes Energy, Bad for Environment.
A great collection of resources here in this Tweet thread by @mtcbtc
Another one, possibly some overlap, by Giacomo Zucco.
Michael Saylor DESTROYS Bill Maher
#5 – Bitcoin wont be secure when the block reward falls in the future.
yo @parman_the random question:— alexandra.btc ∞/21M (@abellusc) July 14, 2021
what year will mining costs outpace block rewards? if we keep halving every 4 years, then eventually won’t the reward eventually become 0 sats?
asking for my grandchildren’s grandchildren