It's $30 which is small in the grand scheme of things, but it all adds up.

It's $30 for a SIM for one person's phone, which could also take 30ish minutes to get (have to show your ID/passport to get it).

You're also paying tips & taxes which you're not used to paying for every meal or purchase (since it's not included in prices), and either sneaking into a bar to use the restroom or buying a drink ($5-10) and then using the restroom instead of paying like €1 (pretty much $1 USD) to use a public one