Talking about data collection is a slippery slope. Surprisingly little of a Tesla ride gets transmitted, so whilst it seems like "A huge fleet of cars out there is collecting driving data", only a tiny amount of it is used to train. And so far, Tesla has a driver assist feature, and a lot of promises that get postponed every time the deadline is up.

Their current set of feature outshines most car manufacturers, yes - but you have to remember: Tesla seems that far ahead because - unlike most other manufacturers - they push their beta-features to the production fleet.

[Edit]: I should note: I don't subscribe to the sentiment that Tesla is "completely faking it" - I think they very much oversell their capabilities, and are nowhere near the point where the driver can stop paying attention (which to me is a core component of autonomy).

That doesn't mean they're anywhere close to self-driving. Anyone can start collecting data and do partially autonomous self-driving with a modest investment - this is a solved problem.