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Re:Postwoman – a free alternative to Postman by legitster on Friday November 22, 2019 @03:20PM (#21609621)
There are tons:

https://en.wikipedia.org/wiki/List_of_generic_and_genericize...

You don't necessarily need to sue competitors for being misleading, but you do generally have to show you are trying to defend your trademarks and a lawsuit is a nice expensive papertrail.

Re:Postwoman – a free alternative to Postman by jMyles on Friday November 22, 2019 @05:42PM (#21610884)
I assert that literally zero of these cases are even close to this one in terms of the degree of abandonment represented by failure to take action against Postwoman.

Can you specify a single one that you think is similar?