Because it isn't just happening in the construction industry. There are restaurants in my town offering a $3000 bonus if servers and cooks commit to 4 months of work. They literally cannot open entire sections of their restaurant because they cannot find enough people willing to work. Same thing with the trucking industry, there was a driver shortage before the pandemic, and it has only gotten worse. People are simply not willing to work so long as they are being paid to sit at home.