Not the only case of this happening; Corporate Social Media providers do not want the Fediverse to succeed at all.
Instagram (and Fascbook, and WhatsApp, and Threads) all censor references to PixelFed.
If you cross post, it is best to watermark your photos with your PixelFed address.











I reckon that is one of the reasons. Lemmy’s (and the entire ActivityPub/Fediverse ecosystem/graph) attracts people with a positive, progressive attitude.
Advertising is based on passive attitude and thrives on negative attitudes.
There was a lot of negative being accepted (and sometimes actively pushed) on some instances, but most other instances defederated from them.