Early Retirement Plan as an Expat in Amsterdam

Once you have a permanent contract, getting a mortgage is pretty easy and renting is significantly higher than the mortgage payments. So, a person can get an apartment, rent it out, and let it pay for itself, while still having money to spare.

So, my question is: what's the catch? It seems easy, but yet I don't see everyone doing it! Am I missing something?

A few details about me:

- Earning 60k, permanent contract, have 30% ruling

- I have savings (more than enough for down-payment and costs) and am left with some money at the end of each month

- I don't want to slave for money for the rest of my life

- I don't like the Dutch weather

- I don't like the Dutch food

- I don't like the Dutch culture

- Needless to say, I'm not seeing myself here in the future, but would tolerate a few more years.

Bonus points:

I know at least 10 people who own residential properties and rent them out. This would be even better than a buy-to-let property, as the interest is significantly lower for residential properties. However, the banks don't want you to rent it out.

I'd get a linear mortgage, because in case I want to sell the house for some reason, I want to own a bigger portion of it. I can also afford putting more money in it on monthly basis currently. If you're into talking details, give some input on this as well.

Goal:

Spending less on rent while here and leaving with an asset, while investing everything I own above my emergency limit in the following years. At the moment when I have my assets net me 1k per month, I'm on my way to Thailand.

___

TLDR:

I plan to get a mortgage, buy a property in The Netherlands, live in it for 2-3 years while heavily invest my earnings in index funds, and once I'd have 1k in passive income, rent the property out and move to a place with low cost of living. Is there a catch? Why isn't everyone who has FI/RE ambitions as an expat in Amsterdam doing this (or thinking about it)?