They've effectively saturated a lot of the "easier" markets (those with a solid fit of weather, demographics, and city policies), started withdrawing from some of the harder/less-profitable ones, and are trying to reach better profitability metrics before another big round or IPO. Meanwhile, as stephencoyner pointed out, they're both testing various models/deals/plans and in Bird's case different vehicle types to try and increase ARPU and retention.
They're both very much alive, but not as shiny as they were a year ago now that market realities have caught up and investors are a bit more wary following Uber's failure to meet IPO expectations and WeWork's debacle.