> The whole point of paying for MarkMonitor is that they're an expensive service for valuable domains

A while ago and, out of curiosity, I did a Whois Lookup to see what big tech companies are using as their domain registrar and found that Microsoft, Google, Amazon, Tesla, Netflix and Shopify are all using MarkMonitor. On the other hand Apple uses "Nom-iq Ltd. dba COM LAUDE", Meta (and its children) uses RegistrarSafe and Nvidia uses SafeNames.