I can only say from the point of view of sanctions why.
Yes, many normal companies have left RuSSia (unlike, for example, Nestle, Kellogg's, Mondelez, German Storck, Perfetti Van Melle, Ferrero, P&G and Colgate, which make their products in China, lol), yes, sanctions will put more and more pressure on the RuSSian "economy" over time...
BUT, the sanctions, in my opinion, are “soft” compared to those that the United States, Europe and their partners have imposed on North Korea, Syria and Iran.
I am sure that no one (if we talk about consumer goods at least) from European or American companies can EVEN trade in such third world countries as Iran (with their terrorist government), Syria or North Korea (the last two are also terrorist states). That is, I think, even Nestle, which is hated throughout Reddit, cannot legally trade there, but if you look, every “dirty” and unethical transnational corporation trades with/sells their goods in RuSSia.
Pootin also launders oil money offshore, so... all means are good for him.
And yet, he is a “former” KGB officer, a bandit from St. Petersburg who has been involved in dubious schemes since the 90s, so what else could you expect from him...