Sorry, but all of the points you've made are completely silly. For starters, Jansch wasn't "giving" his albums or the songs on them away for free.
Your statement shows a complete lack of understanding of how writing credits work.
When you credit a song as "Trad", you are stating that you claim no writing credit. You are also stating that anyone -- ANYONE -- can legally record the EXACT SAME SONG without giving you any royalties.
Anyone could record Jansch's version of "Blackwaterside" and claim the royalties for themselves. That's how the law works. If you disagree with that, then hate the game, not the player.
The difference between him and Page is that Jansch followed the proper process for crediting the songs on his albums accurately
First off, Jansch is no stranger to stealing writing credits. The early Pentangle albums contain several re-writes of blues songs that just happen to credit Jansch as co-writer.
Second, it makes no difference to Jansch if Page "followed the proper process" or not. If Page had credited "Black Mountain Side" as "Trad" (which is what you're so upset about, I presume)......guess what? JANSCH STILL WOULD NOT HAVE RECEIVED ANY ROYALTIES FOR THE SONG!!!
Did you not know that?
The only difference between crediting the song to "Page" instead of "Trad" is that it prevents anyone from using the unique title "Black Mountain Side" without crediting Page. That's all. Page was legally entitled to 100% of the royalties either way.
Oh, and ANYONE can record a cover of Zep's song and LEGALLY claim 100% of those royalties, too!! They just can't call it "Black Mountain Side" without crediting Page.
And Jansch still receives 100% of the royalties for his recording of the song. He hasn't been deprived of one thin dime.
So, to think that he somehow didn't know about Jansch's unique abilities as a player is absolutely absurd.
Bottom line: Jansch credited his guitar part as Traditional. That made it fair game for anyone. (BTW, there have been dozens of covers of "Blackwaterside" over the past 40 years. Many of them copy Jansch's guitar part virtually note-for-note. NONE of them credit Jansch as writer or arranger. Gee, I wonder why you and Jansch aren't mad at them??)
(newsflash, Page set up his publishing company Superhype as one of the first steps when he got Zeppelin started - something none of his contemporaries ever did themselves)
Absolute ignorance. Dozens of musicians had their own publishing companies. Ever heard of Northern Songs, Harrisongs, or Startling Music?
Seriously, you should do a little more research next time.