Its not obnoxious now because uBlock and spam filters works so well, and HTML5 killed Flash. If you don't take such quality filters into account, advertising is far, far worse nowadays.
We're talking about everything before the dotcom boom here. The internet was a lot bigger than WWW, and Macromedia Flash (and Doubleclick) were initiated in 1996. That covers less than 5% of the 20th century. Also, Flash wasn't (ab)used right away for advertising, and if one didn't have it installed not much was missed. Perhaps an online Flash game or two didn't work. No big deal. There was spam on Usenet (the first spam coming from Digital Equipment Corp or was it SUN in the early 80s) and IRC, but it wasn't acceptable.
We're talking about 5% of the 20th century because for most people the internet was only available for around 5% of the 20th century. Doubleclick wasn't the first ad network.
There was acceptable advertising on usenet too in the form of signatures.
We're talking about everything before the dotcom boom here. The internet was a lot bigger than WWW, and Macromedia Flash (and Doubleclick) were initiated in 1996. That covers less than 5% of the 20th century. Also, Flash wasn't (ab)used right away for advertising, and if one didn't have it installed not much was missed. Perhaps an online Flash game or two didn't work. No big deal. There was spam on Usenet (the first spam coming from Digital Equipment Corp or was it SUN in the early 80s) and IRC, but it wasn't acceptable.