Strictly speaking, it is illegal. After all, it is suspected of using these brands to make profits for oneself. But this is also a disguised advertisement for the relevant brands, and it does not damage the reputation and interests of the relevant brands. There is also a so-called "law does not punish the public". So many small companies have used trademarks, and they must be investigated one by one, and it will cost a lot of money. There are too many manpower and material resources, and it is thankless, so there is no need to pursue these brands.