I wonder when the demand side for decentralised GPU marketplaces will kick in. Will probably require heavy BD + Marketing + technical breakthroughs on distributed computing

There's no lack of supply of consumer GPUs rn. 

IO.net has 300K+ GPUs on its network.

IO net has empty demands. Alternatively, check @heurist-ai's portal (https://www.heurist.ai/portal). The consumer GPUs integrated in its network are running workloads in every sec.
Check the generated images (https://twitter.com/XNftVics/status/1775537321149948161)  powered by its miners. The community grows fast!

Heurist is a Layer 2 network for AI model hosting and inference, bridging GPU miners with the open-source AI community.
https://docs.heurist.xyz/ 

I like Crypto, AI, Science & NFTs | Prev: @Delphi_Digital |  Writings: http://tengsthoughts.com | Currently: Chasing a grand ambition