Calling it feudalism is inaccurate and ignores a defining characteristic of feudalism — that it was lineal, you were born into it, you were required by law to work in service of the feudal lord, there was no mechanism of consent or refusal. The only way to escape feudalism was to flee your birthplace, avoid capture by the lord and his armies, and find a free town in which to learn and sell a trade.
That a person using a platform must desire to use the platform, consent to its conditions, and leave at any time is no small difference. It disservices everyone to ignore this very important distinction. We do ourselves no favors when overstating our positions.
I do find it quite interesting that people who malign the (admittedly dysfunctional and misnamed) “sharing” economy as “feudalism” also regularly fail to trace feudalism to its modern incarnation of state levied taxation, which over time replaced the direct provision of goods and services to the feudal lord with monetary payments in currency minted by the lord.
Then again, pointing out taxation is the modern form of feudalism wouldn’t further the argument, would it?