Security spend tweet thread

I saw this tweet on Twitter on Bitcoins security spend. I don’t know how accurate it is but I just wanted to know people’s thoughts on it?

She talks about how the future of Bitcoin does not look good because of its diminishing security over time which makes Bitcoin vulnerable to attacks in the future.

The reason security spend % is going down is that block rewards are decreasing. She mentions that if security spend as % of market cap decreases, it becomes more profitable to attack.

She basically sums everything up by saying: The smaller the % of market cap spent on security, the more profitable and more likely such an attack becomes.

This is already worrying now for Bitcoin. It only gets more worrying with more halvings, unless fee income drastically increases.

What would be a rebuttal argument for this? Or is it true that as fees for miners continue to drop through halving, the more centralized mining becomes from miners dropping out, which makes Bitcoin less secure? Just trying to understand if she is missing something here or I am lol thanks