Excatly
May be 7 8 years ago when it started to be seen at Turkey seas (East Mediterranean Turkish Coast even earlier) We saw one in three tunnels diving point in Fethiye(where Mediterranean joins with Aegean sea) where i live. So to that point all the dive centers started tours just to see one lionfish in Mediterranean.
Now last year even an UN supported lionfish hunting project had been occured. Who hunted the most amount , Who hunted the biggest , and who hunted the smallest lionfish were awarded by a go pro 10 or 11 i think
So they are increasing so quickly