It was, but I feel like the advent of headless browsers marked a step function explosion in browser automation. Also any earlier than 2010 is when I was like 13yo, so it's more like "the dark ages in my own memory" than "objectively dark ages in automation history".
I get that drawing historical boundaries is arbitrary, but Selenium is a really good prior.
Selenium offered headless mode and integrated with 3rd party providers like BrowserStack, which ran acceptance tests in parallel in the cloud. It seems like what browser-use.com is doing is a modern day version with many more features & adaptability.
Sauce Labs is excellent. I've actually used it extensively myself (not sure why BrowserStack came to mind first). I remember Sauce Labs was super active in the SF Selenium community and the Selenium meetups. Just checked my emails. Good memories.