I removed them because on the Wikia's about page it says "Vendor Linking Tip #1 If you have a pattern for sale, list it under the "Sources" on the specific pattern page. Be sure to link directly to the pattern sale page (not to the front page, category or other pages)."
I'm sorry if I am misunderstanding that the links need to go directly to the specific pattern that is for sale.
On the ecrater link that said it was on "hold" I thought that meant it was sold and was unavailable. When I have a pattern that sells on ecrater, it always shows as "hold" until I remove it from my inventory.
Yes, I think it is a misunderstanding. The link needs to go directly to the page the pattern is sold on.
Some websites do not have individual pages for each pattern, e.g.. those two websites. The page it links to has the pattern for sale on it, and no deeper level for patterns, thus a legal page to link to..
The problem with removing on hold patterns is that for some venues that can also mean they are on vacation. I have no personal experience with ecrater, but it is possible that you are correct.