Joint ventures are compulsory. What China does is extorting market access. As for buying: Systematically undermining them by price-dumping and then buying up the carcasses isn't exactly fine business practices either.
China is definitely going to be the enemy of the next 20-30 years, pitting a ruthless dictatorship against whatever freedom and democracy will be left in the Western world.
US also has much stronger negotiating power than China, and it makes international agreements that are mostly beneficial for them. China cannot do that.
For example, if you want to sell your goods in Western countries, your country is often required to join an organisation like WTO. But to do it, you have to comply with their rules. So basically, developed countries are setting the conditions for developing countries. Of course, it is their right, but then it is nothing like a "free" trade.
Also, disrupting Huawei's or Kaspersky's business in US without any international court case, without being able to defend itself, just because government suspects something, doesn't resemble free trade too. It resembles what China does though.
Honestly; how can you call it "theft" if it is done via buying or a joint venture?