I'm doing some research about Information Systems Architecture and I found out that there are some different answers about this topic. I found answers here saying that it is wrong to compare 3-tier with Microservices or SOA, because they are different things. However, I read in both IBM and Microsoft websites that the 3-tier architecture is indeed related to the monolithic one and that there is a possibility to modernize apps, using Microservices for a Cloud-Native Architecture
This is the link to that microsoft page where this last part is explained.
https://www.ibm.com/cloud/blog/four-architecture-choices-for-application-development
IMB also says the same