We know that Yamaha is one of the highly respected company among Audiophiles but it doesn't mean other companies producing are not of high quality and are nonprofessionals.
Your Long research missed all this info below
Bic has the long history of making high quality speakers and are great Value for money
Bic America is among the earliest pioneers in the audio industry, distributing products including Garrard turntables, Luxman amplifiers and Wharfedale loudspeakers during the 1960's.
In 1973, BIC introduced its own brand of loudspeakers and the industry's first belt drive turntables. By the mid 1970's, BIC Venturi loudspeakers were among the top 5 best-selling brands.
The company has emerged as the clear choice for those seeking very high performance audio at affordable prices. BIC products were top-rated 4 times in 1999 alone in comparison with all of the top ten best selling loudspeaker brands!
And Linkedin isn't the official website to provide number of employees. I work in company of more than a lakh employees and i see only few thousands in Linkedin. You found many people using it since more than 10 years. and is see only 94 reviews in Amazon. There are thousands of people using BIC speakers more than 15 years and are happy. Amazon.com itself has 1300 reviews and rated F12 to 4.4/5
Below links are not to say the BIC is the only the best but have been listed Among the Best Subwoofers and speakers through decades.
These are few among 100s of other reviews. BIC Subwoofers are very wel known in Americas and other countries and very less and recently known to Indians customers.
https://slickdeals.net/f/5060972-a-...r-review-bic-america-f12-vs-polk-audio-psw505 - BIC F12 compared with Polk PSW505. and its being compared with Sub priced 38k and has better opinions
https://williamtmayberry.wordpress.com/2016/05/30/you-need-to-read-this-bic-acoustech-pl-200-review/
http://www.bestreviews.guide/bic-america-powered-subwoofers
https://www.lifewire.com/best-home-subwoofers-to-buy-4066815 - 2 Models in same Top Rated list
https://www.overstock.com/Electronics/BIC-America-F-12-Subwoofer-System-Black/3697914/product.html
http://audiolyzed.com/bic-america-f12-subwoofer/
https://flipboard.com/@oddreviews/20-best-bic-america-home-theater-subwoofers-reviewed-by-our-experts---#1-is-our-8mhqsiqaz
https://www.householdaudio.com/best-home-subwoofers/ - 2 models in Top 7 list
https://www.engadget.com/2017/10/09/the-best-budget-subwoofer/ - The best budget subwoofers - top 3 list
http://www.incrediblelab.com/best-powered-subwoofers-reviewed/ - Another List of Top 7
Finally, If warranty would have been an issue the company wouldn't have lasted more than 10 years also and even if lasts more than that it wont be choice of majority of buyers and would disappear from Top list and result in 90% bad reviews.