There's definitely some nuance around how many resources to consume at the client vs the server. Video decoding and ML inference are probably at the extreme end of what you can make a client do.

On the whole, since clients are so constrained, it usually pays to be efficient there - make websites load quickly to increase revenue, require only weak hardware to get more game/app sales, etc. Clients are also untrusted, so there's so many things you can only do on the backend.