After seeing battlefy I remembered there was more eSports or gaming related dbs that were out there but got lost:
Steelseries 2014
UMGGaming 2014
Tear Tournaments 2014 some ranking site it was known as like a UMGGaming lite.
KontrolFreek 2015 was some popular e-commerce site for controller mods.
Jerkyxp 2015 someone popped there woo commerce instance awhile back before they switched to shopifys platform. A popular jerky site for gamers.
Squidgrip 2015 this was another controller mod site that went defunct.
360Icons 2013 I think was the year which is most nostalgic because it was like the first db that brought me into db collecting and this whole db scene. It was like a popular ranking site or forum forgot tbh.
Elgato 2014 it was another popular capture card like merchant similar to xsplit. 
Ironside computers 2014 this was supposedly dropped on raid but I'm not sure if it was a fake version the person who dropped it was a scammer but he gave some free databases out. They mainly had partnerships with faze and the gaming community so I'm including it here.

Steelseries 2014:
Can't find anything about

UMGGaming:
Can't find anything

TearTournaments:
Someone on here likely has and it was likely public at one point, hacked-emails.com (4iq.com, now Constella Intelligence) got it from somewhere.
Hacked Emails [hacked-emails.com] breaches.csv
Sep - 2016,"teartournaments.com",anon,"21,157",5.6 MB

kontrolfreek:
Someone gave the hashes to Hashes.org, so someone likely has

jerkyxp & squidgrip: Nothing I could find

360Icons: https://breached.to/Thread-360icons

Elgato: Never heard of them being breached

Ironside: The hashes were in Hashes.org, so someone must have it.

Apologies for only finding one haha

personally no idea for the moment