To be slightly rude, there is just a wikipedia article by the name "Dumping";
https://en.wikipedia.org/wiki/Dumping_(pricing_policy)The actual legal mechanics are complicated; "Illegal under international law" here specifically entails "WTO agreements allow retaliation in response to dumping".
> and why I couldn't do it for cars or commodity goods.
Specifically, it's more enforced. Governments care about their conventional industry. The way this'd look is say, China providing state subsidy to certain industries in order to artificially lower the price of those goods, making them cheaper than US-based industry could produce, with the specific intent of driving US industry out of business.
Just googling "predatory pricing" and "dumping" will get you examples.
> Also I think that I doubt how enforceable this is in tech industry as for the most part, they are selling a service and each service is different and thus have different price points and therefore the company should have the ability to decide prices technically.
The problem for tech is this difficulty in assessing "real value" and the assumption that running at a loss for extended periods is "normal" for tech companies.
For a clear-cut example, consider Uber, who paid drivers more than they charged the passenger(s). This is obviously predatory. Uber has tricks like moving insurance/maintenance to the driver's wallet, but a taxi can't be cheaper than what they pay the driver.
> why does the govt. interfere b/w them? Does this not impact their rights/freedom?
It does impact their freedom, but the reason why the government intervenes is long-term health of the market.
Things like a 'firesale' because you're going out of business, or moving to a new warehouse, etc, are fine. A single store (even a big-box one) going out of business won't crush the entire market and it's only of short duration.
The problem is that dumping/predatory pricing is a strategy to maintain a monopoly. (Or in the cases of extensive investment funding, build one)
Again, consider something like Uber (but the same applies to any "rental"/gig-economy company). They sell rides below cost paid for by their huge pile of investment money, no other taxi company can compete. All the competing taxis go out of business. Uber can now raise the prices to obscene levels and cash in.
Whenever someone tries to start a new taxi company, it'll be small and local, so Uber just lowers their ride prices in that region again until they go out of business. And because they're small they don't have as much money as Uber so they'll go bankrupt first. Uber keeps the monopoly.
Such monopolies are long-term bad for the entire economy.
On an international level, it's China and steel again. China subsidizes their industry, industry in other countries can't compete and goes bankrupt, China can now raise their prices.