Advertising's place is as a vehicle for emotional manipulation and stuffing all available channels with propaganda selling the advertiser's particular brand of product or politics.
Certainly it can also be used to dispense useful information, but if someone is spending money to dispense that particular information, they have an agenda. It might be innocuous, "buy our product!". Or it can be malicious. Either way there is always intent and you cannot separate media, especially advertising, from the intent behind the media and the very goal of advertising is to grab (or accost or steal) your attention.
The internet already has alternate funding mechanisms: the host either eats the cost themselves and pays for it out of pocket, sells something to pay for hosting and other expenses, or users pay the host directly for access. Advertising is just one of at least four options.