Startup investing is not based on revenues, like it would be if you were investing in a part share of a restaurant or something like that. When a startup is valued at $10 million, it doesn't mean that the company, as is, is worth $10 million so much as that it has a 1% chance of one day being worth $1 billion.
The way you make money investing in startups is to make a lot of bets that each have a small chance of paying off big. So while I'm not saying anything about the specific companies you list (most of which I don't know anything about), a list of recent startup fundings should always include a lot (perhaps a majority) that investors will ultimately lose money on.
The problem is, you don't know which the winners will be. They usually tend to look very unpromising. If you'd made this list 5 years ago, it would have included a web site for college students, bizarrely thought to be worth tens of millions of dollars.
A bubble is when investors are making lots of money off other investors by trading stuff that isn't worth anything. Risk is being grossly and broadly mis-assessed (deliberately or inadvertently). The bubble pops when people realize this.
In that sense, "majority of startup companies will end up losing money" is actually not a bubbly thing at all. Bubble mentality would be "most startup companies will IPO for huge valuations within a few years."
All of what you've said is true. However, there is still a trend in rising valuation (near bubble level), of which many other investors have noted as well.
The way you make money investing in startups is to make a lot of bets that each have a small chance of paying off big. So while I'm not saying anything about the specific companies you list (most of which I don't know anything about), a list of recent startup fundings should always include a lot (perhaps a majority) that investors will ultimately lose money on.
The problem is, you don't know which the winners will be. They usually tend to look very unpromising. If you'd made this list 5 years ago, it would have included a web site for college students, bizarrely thought to be worth tens of millions of dollars.