What are the pros and cons of an indoor playground?

I prefer to bring my kids to indoor playground compared to outdoor because: - cleaner than outdoor playground as outdoor playground is dirty and exposed to sun and rain without anyone cleaning them - safer than outdoor playground as the structure in indoor are safely designed and padded. Also, indoor playground is safety guarded and can't enter without paying so less worried of kids being carried away by people. - less risks of bacteria and virus spreading around. There are more cases of kids contacted hfmd virus from outdoor playground The major con is indoor playground is very expensive and is hourly basic while outdoor playground is free most of the time.