It's a much cheaper way to run a freemium pricing plan than to give out actual time on a real GPU.
The free models aren't as advanced as the commercial ones, so you still need to pay to get better service. Many companies do this by hosting the smaller models for free, and charging for access to the bigger ones, but the costs of running even the small models adds up, so if they can get you to run it on your own hardware, they save a lot on GPU time, but still get the advertising exposure of a freemium pricing plan.
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It's a much cheaper way to run a freemium pricing plan than to give out actual time on a real GPU.
The free models aren't as advanced as the commercial ones, so you still need to pay to get better service. Many companies do this by hosting the smaller models for free, and charging for access to the bigger ones, but the costs of running even the small models adds up, so if they can get you to run it on your own hardware, they save a lot on GPU time, but still get the advertising exposure of a freemium pricing plan.