I really have no idea what an eggspot is... she is ~3inches from nose to tail, and I am pretty sure his tail has always been like that... never showed any sign of tail biting or ripped fins. I think? Will post a new video tonight, will see if I can get him to flare.
“It does not do to dwell on dreams and forget to live.”
3 inches is actually close to full grown. See if you can get him to flare and spread his tail out. Otherwise, he might be a plakat or a roundtail. Judging from the anal and dorsal fins, I don't think he's just a veiltail. He's a short-finned betta of some sort.