Is there any service that exists to do this for people?
Like say you want your Twitter forwarded to your Facebook page and email list, you just punch in the logins and it does the rest?
Ideally it would fill in the details like formatting the images/video correctly
There are some examples at https://fedi.tips/crossposting-between-mastodon-and-other-so...
The key point is that you must not post in XTwitter first, but you have to use the crossposter's client as source. Pulling content out of XTwitter, even your own, is onerous.
Many.
Search for social media management tools.
If This Then That?
I used to cross post any Instagram photos to twitter with if this then that. But the platforms have made it harder.
I thought hubspot does that but looking at their website I have no idea what they do..