Remove wordpress embed share icon?

This has been answered here: Removing WordPress Icon from oembed link footer .

From the answer to that question:

Here’s the code to remove the site icon markup from embeds:

add_filter('get_site_icon_url','__return_false', 10, 3);

If you want to remove the entire site-icon + site-title then use this:

add_filter('embed_site_title_html','__return_false');

The right thing to do though would be to upload your own site-icon in
the WordPress customizer and show-off your branding. Min image size it
needs is 512px.

This article might also be helpful: https://premium.wpmudev.org/blog/embedding-wordpress-oembed/