I received an email today titled "A limited-time offer to last a lifetime" from Plex offering Plex Pass lifetime for $74.99.
The email reads: "We're going old school with a throwback to the original lifetime Plex Pass pricing. Thank you for all of your support!
This exclusive discount on a lifetime Plex Pass is available now through 11:59 PM PT on Tuesday, May 26, 2020. This code is for your account only and can be used once. As a reminder, a Plex Pass gives you access to all premium Plex features, like Live TV & DVR, Mobile Sync, Movie Trailers & Extras, Premium audio features, and many more."
Sure this is YMMV, as I've seen this offer multiple times on SD previously yet this is my first time receiving.
Stay healthy and prosper!