I haven't read the "algorithm" and this observation might be seriously out of date, but:
for Google Ads, you couldn't easily know what ads would be shown for a given query, without a whole lot of data that's not contained in any code: the experiment settings in the server, for one thing. And the user who's doing the query, for another.
An "experiment" could apply to 100% of the traffic, so it's not really an experiment anymore. And even if you think X has been put into production, there is still a "holdback" experiment, where some part of the traffic does not get X applied to it.
for Google Ads, you couldn't easily know what ads would be shown for a given query, without a whole lot of data that's not contained in any code: the experiment settings in the server, for one thing. And the user who's doing the query, for another.
An "experiment" could apply to 100% of the traffic, so it's not really an experiment anymore. And even if you think X has been put into production, there is still a "holdback" experiment, where some part of the traffic does not get X applied to it.