Email address database compromised or sold?

In the recent past (including one today already and one claiming to be sponsored by Plex for a VPN service), I have been receiving SPAM emails from third parties to the email address I use for my Plex account. While the concept of SPAM in my inbox is not a new one, the idea of them being sent to this account in particular is as this account is ONLY used for my Plex account and has never been used elsewhere. This leads me to worry that either Plex has had some sort of breach or that they are selling their email list.
Anyone else having this issue?

WilhelmStroker - Thank you for that … that post reveals alot. In that post, there is a mention of a Plex breech that occurred in 2015 - https://haveibeenpwned.com/PwnedWebsites#Plex

@plexsmiths said:
WilhelmStroker - Thank you for that … that post reveals alot. In that post, there is a mention of a Plex breech that occurred in 2015 - Have I Been Pwned: Pwned websites

Indeed there was. This was what prompted the change in forum software. Also, everyone was emailed and all passwords were reset at that time.