EVs: There were plenty of EVs before Tesla and Tesla itself was founded by Martin Eberhard and Marc Tarpenning.
That said Teslas are badly constructed vehicles and are still unaffordable.
Boosters: I already gave credit for boosters so not sure where I was being dismissive. But the concept of reusable boosters isn't new. NASA recovered their boosters by parachuting them into the sea.
Boring Company: What projects are they doing?
They dug 2.4 miles of operational tunnels in 7 years lol and have now shelved that.
They are a failed endeavour.
Paypal - Its true he did not co-found it. He did not play a role in its success either. Infact it became successful after he was ousted.
He founded X.com. But investors replaced him with Intuit CEO Bill Harris.
X then merged with Confinity and the merger was called Paypal. Musk returned as CEO, but was ousted him because of his lack of knowledge of technology (yeah he is no engineer like he calls himself), and lack of a business model. He was replaced by Peter Thiel.
It was eventually bought out by eBay.