Being new doesn't make something right either and they have been less tested. Also, the Lindy effect suggest that ideas that have been around longer will also continue longer.
I don't know the details but look at what Slippery_John said in his comment:
> Well yes, but actually no. Not all proteins are equal, they have different quantities of different kinds of amino acids. Humans need 9 distinct amino acids for a healthy diet, and animal proteins are by far the easiest source of "complete proteins" from a single source. It's absolutely possible to get plant-based complete proteins (e.g. soy or quinoa), but often that involves deliberately mixing different protein sources to get a complete balance.
These are people in some of the poorest countries like Bangladesh. Are pea proteins cost effective and available in sufficient enough quantities to feed all these people? Other people brought up that it isn't just about the protein but other essentials things like amino acids.
There are several examples of cross-species breeding resulting in viable offspring that can reproduce. You mentioned two breeds of domestic dog but domestic dogs can also breed with grey wolves. The domestic dog is considered a sub-species of the grey wolf. Coyotes can also breed with the grey wolf. Dingoes and jackals also fall in with domestics dogs, wolves, and coyotes. It isn't just canines either. The Savannah cat is a cross breed between African servals and domestic cats and that is not the only example for felines. Beefalo and Żubroń are examples of cattle/bison crossbreeding. Sumatran and Borenean orangutans are different species that are able to crossbreed.
On YouTube can you set your name to anything, including the name of another channel. This leads to accounts with the same name and profile picture as the actual channel commenting on any popular video. These accounts typically have no subscribers as they are not channels of actual creators. Having 100K subscribers proves you are an actual channel with fans who will want to know if a comment posted under that name is the actual content creator.