Yes and you wont be able to scrape alot.Do I need proxies when using only bing?
Its good footprint but not best. Tumblr blog can be 404 and not available for registration. Sometimes low x% 404 blogs can be registered.Had problems using the 404 footprint.
SB is good tool, but if you plan to find tons of expired tumblr blogs its not that good, something custom made would be way better/easier.Is it possible to use only scrapebox to find experienced tumblrs?
Yes and you wont be able to scrape alot.
Its good footprint but not best. Tumblr blog can be 404 and not available for registration. Sometimes low x% 404 blogs can be registered.
SB is good tool, but if you plan to find tons of expired tumblr blogs its not that good, something custom made would be way better/easier.
Keep in mind - many people look for expired tumblrs for money and they do that at huge scale so its not that easy to find really good expired tumblr blog without good and automated system.
Custom madeDo you have any specific tools to reccomend?
I was able to scrape around 12-15 milions unique tumblr blogs + filter them by expired ones, by PA and register blogs i wanted. 50+ was wery rare. 60+ were like less than 5 per scrape (i did such scrape every 2 weeks) sometimes no 60+. You are looking for a unicorns bro, this probably wont happen. Better buy from someone who is selling blogs here on market. Your time, $ for proxies and vps is worth way more than few PA 50+ blogs a month.with pa60+?