Here is a different example.
If you require medical treatment in the UK and you dont know English an interpreter is called. If you are deaf BSL user this is also meant to happen but too often does not. A lovely lady i know died last yr because the hospital did not provide an interpreter and the extend of the problem wasnt know in time.
BSL uers continue to be oppressed and not provided with language in the same way as other non English or English users are.
Families of deaf children are discouraged from this language still. Those who choose BSL have to find and fund these courses them selves and are continually questioned on why they are using BSL. Despite the researched and acknowledged benefits and need for sign languages.
Meanwhile children born hearing (with and without other needs) are celebrated for learning to sign.
Baby sign, makaton, signalong, sign songs, sign for dementia etc etc is seen as amazing while the native language users are still oppressed.
Deaf led/fluent BSL users companies, courses and resources are pushed aside by items run by those with little to no understanding.
When these novices are challenged over these courses/materials other novices rush to their defense with comments like
They are amazing ive learnt so much
Why wouldnt you want people to learn sign
They are only trying to help
Deaf people/BSL users can set up if they want
Just be grateful someone is using sign
Thats different as the person is a baby/old/disabled etc so cant learn BSL 
There are courses advertised on social media every day. Often these courses even have a lovely picture of someone doing a sign - a sign that isnt even a real sign for anything. The courses mislead participants in what that course is. Meaning too often people end up paying money for a cpurse which at best isnt recognised and at worst will teach wrong. This is not fair on authentic courses, it is not fair on BSL langauge users and it is not fair on the poor person who has speant time and money on it.
There are people posting videos 'teaching signs' which they have learnt from a book or google. There was a video last yr which was a mix of BSL, ASL and non signs. Lots of non signers raving about how brilliant it was and how much they had learnt. Poster with 1000s of likes etc.
When someone posts explaining the mistakes and with linls to genuine resources. They are jumped on by supporters. Private message politely explaining and with info on where they can learn are ignored.
Many people learn BSL and it is hoped it will soon be part of the curriculum. The issue isnt people learning/using BSL. The issue is people setting themselves up as an expert, producing a product which a already exists, that theirs is not just substandard but damaging to the language and culture.
Somepeople genuinely make mistakes and are approachable and willing to learn and either step back to promote the expert courses, services, product that already exists. Or of it is a genuinely new and useful concept they will work in collaboration with the language ecperts to ensure that the product is authentic and acurate.
Those who continue to ignore and do their own thing despite it being explained are appropriating.