Google buys Start-Ups all the time, since many years. Why should they stop now? Why should acquiring Start-Ups now be any different for them then a year ago or

Google buys Start-Ups all the time, since many years. Why should they stop now? Why should acquiring Start-Ups now be any different for them then a year ago or two? Also they can't buy everything at once, so of course some of the features they would've liked to integrate earlier must come later now because the buying process took some time or there was no Start-Up about that topic, when they actually wanted to buy one.