AlmightyDoorman

One of the advantages of CachyOS ist the compilation with the x86-64-v3, x86-64-v4 and Zen4 instruction set. If your cpu does not support any of these sets your theoretical performance gains will be smaller since you do not get the advantage of these tailored compilations. The other things Cachy does like increased swappiness etc. should still work. Check the wiki to see if your cpu supports these sets.

Not exactly what you mean because there are also bad actors but take a look at i2p, in some ways it feels like an retro internet.

Yes, all I2P addresses are only available from within the I2P network.