That's the simplistic capitalistic caricature of it, meant to stoke fears of loss of liberty and submission. That people keep repeating the meme and lie that "communist societies can only work if everyone is selfless" is in fact really a reflection of how little people critically examine the narratives repeated endlessly by the pro-capitalism ideologues.
In particular, this idea that workers in communist society are lazier because they don't "own" the fruits of their labor would be utterly ridiculous to anyone who has spent any time as a mid-level manager for a large corporation (experience which I have).
Workers in corporations are often lazy too, because they don't own the corporation (particularly since stock compensation is limited to the CEOs and top executives) and rarely get to see an equitable share of the profits. They have to be motivated by things closer at hand - liking the team / coworkers and not wanting to fail them, having a good manager who looks out for their needs, and having the occasional and real financial incentive in the form of bonuses. Any mid-level manager going "You are in a capitalist system so you should perform better!" would be laughed at as someone just trying to snivel their way to top management.
That's the reality of your average large-institution workplace. It applies equally whether you're working for a communist government or a large multi-national corporation.
That's why communism should not be seen through the invented caricatures but rather its core concept - which is the public as opposed to private ownership of large-scale "means of production" such as factories. The system, as evidenced by Sweden, can in fact work but only if the government actively acts in the best interest of its citizens. Indeed, it can be argued the system can only really act in the best interest of its citizens if it was democratic and allowed the ordinary citizen a greater say in how the country should be run.
Most governments are in fact not very good at this. That is why (especially in the United States) they keep extolling the nonsense claim that capitalism is the bestest system ever, even as government spending actually increases as a proportion of GDP and said countries are actually becoming more communist. They are basically shifting blame to corporations / private industry even as they actually take more control of the economy.
That's why also many countries end up being police states - it's easier to suppress dissent through force or propaganda than to actively work for the best interest of their citizens. That the Western world has delusions of being immune to their own lies and propaganda just because it has (an increasingly not-free) press is really a damning indictment of why it's unable to solve big problems.
In short, the system matters much less than the leadership. A capitalistic system stuck with uncaring leaders interested only in their own wealth (e.g. Russian oligarchs) is just as awful as a communist system with that kind of self-serving leadership. But no one in the political establishment wants to admit to this narrative as it holds them accountable.
Again, that's the caricature based on how the Russian economy has basically acted since before the communist revolution. By contrast there aren't black markets in Sweden.