@vbabka With or without bitcoin, any service almost that tells you that you can earn by consuming is suspicious because the cost is generated anyway somewhere, including the environmental cost. For me this looks like crowdsourcing your mining enterprise more than anything else, definitely not green energy.
I do use a service called
Storj.io, which is based on proof-of-stake distributed S3 space but it is totally different story. There the blockchain is used to book keep the stake of sharing space to the service. I used that service for 6 months without even knowing this. As a customer I just pay my $2-3 cloud bills for cheap S3.
Investing on currency, even euros, is usually a scam that I do agree :-) For using blockchain to distribute a contribution to a cloud storage service, it is just super cost effective for me as a consumer, cannot help it 🤷 In that context it is not about currency, it is about shared contract.