https://web.archive.org/web/20200807211354/https://mycroft.a...
https://web.archive.org/web/20200516014621/https://mycroft.a...
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[Edit] Ok you've edited so my reply no longer makes sense, but one case or two there would be legal costs to mycroft regardless.
1. Patent troll entity filed a suit in east Texas, c. February 2020 (https://web.archive.org/web/20200410225148/https://mycroft.a...).
2. Same patent troll entity dropped the first suit, also c. February 2020 (https://web.archive.org/web/20200305135828/https://mycroft.a...).
3. Same patent troll entity filed a second suit in Kansas City on February 18, 2020 (https://www.bizjournals.com/kansascity/news/2020/03/30/mycro...) (https://web.archive.org/web/20200807211354/https://mycroft.a...) (https://web.archive.org/web/20200516014621/https://mycroft.a...).
This second suit seems to have substantially cost Mycroft.
[0] Tumey L.L.P. et al v. Mycroft AI Inc. et al Case No. 4:21-cv-00113 (W.D. Mo.) Complaint https://fingfx.thomsonreuters.com/gfx/legaldocs/egpbkqlzqvq/...
[1] Id. at 13.
I have my doubts, however, about the narrative in this article. Mycroft first posted about the patent troll to their blog on February 5, 2020 (https://web.archive.org/web/20200303015458/https://mycroft.a...). Eight days later, on February 13, 2020, Mycroft published a second post stating that the patent troll dropped their case (https://web.archive.org/web/20200305135828/https://mycroft.a...).
I am sympathetic to hardware startups, but in Mycroft's case, ongoing patent troll litigation was not the apparent cause of death.