I've shared a few crssnt RSS feeds in the past to promote the service a bit but never saw any real traction.
More than 3k invocations in a single day is about 10x the usual traffic that my sheet-to-RSS service built with Firebase Function gets.
I don't know if it's just a few users trying out the service extensively or a bigger group. Nevertheless, it's very exciting to finally see some traffic.
The last few days the usage seems to have settled at just below 1k invocations/day which is still great.