There are so many pizzerias because pizza is a popular and versatile food that appeals to a wide range of people. It is relatively easy and inexpensive to make, and can be customized to suit different tastes and dietary preferences. Additionally, the pizza industry is highly competitive, leading to a large number of pizzerias vying for customers. Finally, the rise of fast-casual dining and delivery services has also contributed to the proliferation of pizzerias in many areas. **

Many pizzerias are open on holidays and offer pizza delivery services. However, it ultimately depends on the individual pizzeria and their holiday hours. It's always best to check with the specific pizzeria in advance to see if they are open and offering delivery on the holiday you are interested in. Some pizzerias may have limited hours or may be closed altogether on certain holidays. **

The plural of "pizzeria" is "pizzerias." This is because "pizzeria" is an Italian loanword that follows the standard English pluralization rules, which typically add an "s" to form the plural. "Pizzerien" is not the correct plural form in English. **

Pizzerias are able to make such good pizzas due to a combination of factors. First, they use high-quality ingredients such as fresh dough, flavorful tomato sauce, and premium cheese. Additionally, pizzerias often have skilled pizza makers who have mastered the art of stretching and tossing the dough, as well as knowing the perfect balance of toppings and cheese. Finally, pizzerias typically use specialized pizza ovens that can reach high temperatures, resulting in a crispy crust and perfectly melted cheese. All of these factors combined contribute to the deliciousness of pizzeria pizzas. **

It is not common for pizzerias to not have good pasta. Many pizzerias also offer a variety of pasta dishes on their menu, and they often take pride in offering high-quality pasta options to complement their pizza offerings. In fact, some pizzerias are known for their delicious pasta dishes, and they may even have a separate section of their menu dedicated to pasta. Overall, it is not typical for pizzerias to not have good pasta, as they often strive to provide a well-rounded Italian dining experience for their customers. **

There may be a few reasons why pizzerias do not typically make dough out of oats. Firstly, oats have a different texture and flavor compared to traditional pizza dough made from wheat flour, which may not be preferred by customers. Additionally, oats do not have the same gluten content as wheat flour, which is important for creating the desired elasticity and structure in pizza dough. Lastly, oats may not provide the same level of rise and airiness that is typically desired in pizza crust. Overall, the unique characteristics of oats may not align with the traditional expectations for pizza dough. **

As an AI, I don't have personal preferences, but I can tell you that the taste and quality of frozen pizza can vary greatly depending on the brand and ingredients used. While some people may find frozen pizza to be less appealing compared to pizzas from pizzerias, others may enjoy the convenience and variety of options available with frozen pizza. Ultimately, it comes down to individual taste and preference. **

There is no evidence to suggest that there are many pizzerias in Germany and Austria that are money laundering operations. While money laundering can occur in any type of business, including restaurants, it is not accurate to say that there are many pizzerias specifically involved in such illegal activities in these countries. It is important to rely on credible sources and evidence when discussing criminal activities in any industry. **