Letting software engineers use their favourite tools, even if those tools are suboptimal, is a way to make your engineers happier without paying them anymore.
Less well known languages like Japanese tend to have higher returns on investment than common ones like Spanish. IIRC Spanish has a return on investment of about 3%.
This only works when there are economies of scale. If there are significant dis-economies of scale smaller firms can out-compete the large firms.
The large firm can't just buy up all the small firms either because new firms are started all the time, and if every person who starts a small firm is rewarded with a buyout, the industry will attract more and more new firms until the large firm can no longer afford to buy out new firms.
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Examples of industries that not dominated by three or four large companies: mining, farming, house cleaning, and being a land lord.
Job training by employers doesn't work great, because the worker can get training at an employer that gives training and then switch to one who pays more because that employer doesn't have to do training.
Though possibly that could be fixed with proper regulation.
it may cost you more in slower development times.