Beehaw has been online for over 18 months, it was well established when there were only 30 Lemmy servers and then Reddit API change came along in May... the sign-up page and application process couldn't even cope with hundreds of users per day.
Then 1000 new instance servers went online in just a couple months where your 18-month established presence was suddenly getting all kinds of server to server action.
You have been on the front-line of a lot of people motivated by hate of Reddit. Not love of Beehaw.
Lemmy and Kbin both lack a lot in moderation and anti-spam measures. Both apps are taking about having features to specifically throttle new local members. And anti-spam in terms of server to server doesn't really exist at all.