Google's Eric Schmidt went all out yesterday, saying he was "very proud" of his company's tax "structure", and that "it’s called capitalism."

Inevitably, this had led to calls for a boycott of Google [2] until it starts to pay its fair share of corporation tax.

Of course, these calls have also marked out part of the folly of such boycotts. It's easy to boycott Starbucks: within 30 seconds walk of most UK branches you'll find more coffee. We are basically a nation of people selling coffee to each other with a bit of banking on the side.

Google is… harder. If you use any of its web services, you are likely to feel locked in (everyone knows your gmail address! Think how much work it would be to change your address books!); if you have an Android phone, you are probably contracted in without even a choice to leave; and if you use their web search, you'll probably have finished the search and clicked on a link before you even remember that you were supposed to be boycotting in the first place.

On top of that, of course, a boycott doesn't look like it would be as effective for Google as it was for Starbucks. Within days of the first allegations about the coffee company coming out, it had posted an open letter on its website; and then even before the big UK Uncut protests, it had already agreed to radically restructure the way it declares its taxes. Comparing that to Schmidt's bombastic comments, we can infer that Google might put up a bit more of a fight.

The thing is, people ought to be boycotting Google, especially their main cash cow, web search. Not because of tax avoidance, but because it makes a terrible product used only through exactly the same inertia which will kill any political action.

Once upon a time, Google search was the unambiguous best. Its page-rank system, which replaced manually editing search results with an ingenious methodology which used links to a site as guarantors of that site's quality, meant that it gave more accurate results than many of its now-defunct (or nearly so) competitors like Alta Vista or Yahoo! Search; its simple UI made it easier to use, as did its massive step up in speed, a fact reflected in its show-off display of how many hundredths of a second the search took.

Most importantly, Google refused to offer paid placement, a relatively common practice at the time which mixed advertising with editorial content: companies would literally pay to appear in the search results for a given keyword.

Those principles lasted a long time; even when Google started "personalising" searches, it was still aimed at reducing bad results. Someone who always clicks on cars after searching for "golf" probably wants different results than someone who clicks on sports sites.

Then came Google+. Terrified by Facebook, the company launched a rival social network, and in an attempt to catch up, decided to leverage its existing businesses. Personalised searches are no longer based just on what you have previously searched for. They're also based on your Google+ contacts, and what they've posted about and discussed. A piece written by someone "big on Google+" – a dubious accolade – can get boosted up the results based just on that; and strangers' faces have started popping up in results, like this:

It's not just the failed attempt at cross-promotion which has damaged Google; it's also been hit by the falling value of web advertising as surely as every other web business. It's responded by increasing the amount of page space devoted to selling things – and correspondingly decreasing the space devoted to it's actual product.

Compare, for example, this from 2005 [3] with this from June this year [4]. Although it's looking at Google US, don't doubt that it's coming your way as well.

There are alternatives. I like DuckDuckGo [5], which consciously strives to replicate the experience of Google circa 2005 (albeit with a number of powerful below-the-hood improvements). I'm not the only one; the site has shot from an average of 80,000 searches a day in December 2010 to around 1.7m a day this month [6]. But really, it doesn't matter where you go – even if it's to Bing – so long as Google gets the message.