Some law firms will take any case if they're desperate enough, regardless of the merits of the case. I haven't seen the actuarials, but my guess is that there's money in boiler plate threats of litigation against entities who are in line for windfalls (either through mergers, or in this case, a massive market cap explosion) for whom the cost of settling pencils out better than the potential costs of protracted litigation.
As pointed out by previous posters, this ain't this firm's first rodeo
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