If this stuff is any good, Tesla should make it available for everyone to use colab-style. A hosted Jupyter notebook in a sandboxed VM able to send jobs to this new silicon is something that might be possible to set up by a small team in a few months, and could turn into a billion dollar business. As a bonus, Tesla can use revenue from that to grow this supercomputer, while using any spare/unsold capacity for themsel…
It is already Tesla's plan to build AWS-style paid access to Dojo. I think they said that during the first AI Day. Here's a 19 minute supercut of AI Day: https://www.youtube.com/watch?v=keWEE9FwS9o
But I think that was the wrong strategic move - they should have opened it up, together with some 'Tesla AI' demo models, in a colab environment. They can hire new employees to do that - it is separate work from that involved in making the self driving car, and will not block or interfere.
The only reason I think they might not is that they don't want to step on Googles toes - there are very close links between Musk companies and Google, and a direct competitor to Googles TPU product might hurt that relationship more than it generates in revenue.