Must have changed opinion - latest version released last Saturday.
Lifted from the support forum of JoinFS dated 9th May, 2018
Unfortunately, I will no longer be devoting any time to JoinFS. I know a lot of work has gone into it, at times, over the last eighteen months, but I simply no longer have the time, and it generates only a tiny fraction of the revenue to make it anywhere near worthwhile. It's in a reasonable state as it currently stands so I'll leave the forum and the website up for the time being.
Any queries, please PM (Private Message) me on the forum.