I was surprised during our snowstorm with 1"+ coming down per hour starlink stayed up. It wasn't great, but we still had 2-3 streams going at once and only saw buffering a few times.
In the field of satellite communications, Starlink has an incalculable advantage in that they effectively own the launching system and give themselves deep, deep discounts.
First mover advantage is important, but smart phones existed years before Apple came along and completely redefined the field. But in this case the hurdle of getting hardware into space is so tall that the only way someone else can compete is if they own or partner with a reusable launch provider. Amazon has a chance. I think relativity might get there. but their programs are equivalent to the falcon one. Spacex is 2.5 generations beyond that, and even discounting starship they are already putting more hardware into space each year than most other providers have put up since their inception.
Spacex isn't waiting for someone to catch up, though, with starship they are leapfrogging over themselves and will maintain a significant lead in launch capability for at least 5-10 years. By that time they'll have so much hardware in space, and so many ongoing contracts to put new hardware up and maintain old hardware, not to mention human spaceflight, that it will be hard for anyone to catch up.
On top of that, they have 2.2 million starlink customers as of December 2023. That's over $200 in revenue every month, or $1.2 billion every year. If someone competes, Starlink merely has to slow its launch cadence and drop its prices.
So I don't see any viable internet satellite providers competing for customers anytime soon, and the only thing starlink has to fight against right now are fiber installations being funded by the government. They weren't able to cash in on rural internet subsidy, so I would be very surprised if they weren't lobbying to end such subsidies altogether to force customers into starlink.
They are expecting to bump that up 50% this year. 
