"One of the first things we noticed was that the traffic patterns between supertokens.io (our actual domain) and supertokens.com were nearly identical. Whenever our .io traffic had a big spike, so did the .com, even though there was nothing on it yet. More importantly, these spikes meant that a significant portion of potential users went to supertokens.com directly."
If they're driving traffic spikes to a domain squatter - probably reasonable to assume owning both those domains is helping.
Plus - 8k is a pittance, all things considered.