Look at their home in Seattle. The influx of people is pushing up housing prices to pretty unbearable levels. It's not as bad as the Bay Area, but the homeless situation there has been bad for a long time.

The large Seattle companies also work in discount deals for housing, which is far from ethical or fair:

https://www.seattletimes.com/seattle-news/politics/is-it-hou...

People are critical because Amazon has rarely given to charity, or when they do it's something like letting a charity temporally use an existing building before they renovate it:

https://www.huffingtonpost.com/entry/amazons-donating-a-buil...

I mean, maybe we shouldn't be so critical if Bezos is legitimately concerned and they're doing something, but I can understand why people are skeptical based on their track record.