for newsletters that are more "news aggregator" types that collect various blog posts/info, do they typically reach out to the authors before including the link

for newsletters that are more "news aggregator" types that collect various blog posts/info, do they typically reach out to the authors before including the links in the newsletter asking for permission? I've run a network of around 10 newsletters of this type for about 10 years now and no, extremely rarely (usually only if something is obviously being kept on the down low or if a flood of traffic would be likely to cause problems, such as personal projects that use a lot of bandwidth). It hasn't been a problem though. People are generally very happy to get the attention and visitors in my field, but all of our links are positive and shining a spotlight in style, not criticism or making fun, etc.