It's rude to link to an ugly site when you could link to a better, more readable one. It's rude to lie and manipulate people for money, when you could easily avoid doing so. Advertising should not be encouraged, ever.
When you have the opportunity to show someone an ad-free, single page, uncluttered version of a piece of literature, do it. Please. Always.
Advertising is basically all manipulation and lies. If it isn't, we just call it "information".
Look at what they call "underwriting" on nonprofit independent or public radio stations. "This production is brought to you by Bill's Shoes, 123 Main Street, Saginaw. Selling Men's and Women's shoes, boots and sandals since 1982."
Advertising goes beyond that, using false superlatives, misleading copy, calls to action, and peer pressure, at best. At worst it's just lies. There is nothing free about "buy one get one free", for instance. It's a lie. Sales, "deals", "limited time only" -- these are psychological games. Manipulation. Often, the "everyday" price the sale prices is marked down from, is a lie. Misleading propaganda at best. Straight up fraud at worst. This is the everyday "harmless" content we allow our children and politicians to watch.
And that's just traditional television, radio and print advertising. What passes for advertising on the internet is uniformly awful. I'd call most of it malware.
When you have the opportunity to show someone an ad-free, single page, uncluttered version of a piece of literature, do it. Please. Always.