It’s been over twenty years now of processing data from radio telescopes looking for signals of intelligence. There has been an ebb and flow of the data collected vs the processing power to go through it. We seem to be in a time of more processing than data gathering again.

First Seen : Mon, 12 Apr 99 07:58:51 -0400
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There is a nice article talking about the 20th anniversary here:
https://www.theringer.com/tech/2019/5/24/18637942/seti-home-aliens-citizen-science-extraterrestrial-life-20th-anniversary