Maximum theoretical capacity of bitcoin for 100 years is 21 terabytes, right?

4MB x 24 hours x 6 blocks per hours x 365 days x 100 years

How much is a terabyte these days?

The cost to run a node that will last 100 years today is not that high.

Ordinals are a form of attack on bitcoin. But frankly, my perception is ideological attacks are more dangerous than this.

I run a node, but you're right I don't think about these kind of network attacks as much as yourself or Luke. And I sleep better at night knowing you guys worry about this.