I have had at least one bot in every match tonight between midnight and 7:30 am EST. Only one game where there were no bots. In the match I just completed, my entire team (all four teammates) consisted of bots. This is getting ridiculous...
I went 15/5/2 with Lux. Tried my best. Took out a tower. After the 25 minute mark they were all just standing on the summoner platform waiting for the game to end--presumably the script being used doesn't expect a match to last longer than 25 minutes one way or the other (a pretty reasonable expectation for bot matches most of the time).
I've been reporting for cheating / intentional feeding / afk and trying to describe what I see them doing. For instance, standing in the middle lane behind the tower outside of XP range. Charging the tower and auto-attacking it, dying from tower hits. The afformentioned standing on summoner platform spamming /dance so they don't get leaver-busted.
They're not completely terrible (oh they are bad). They'll try to attack champions. They seem to look for opportunities to get assists / kills when they happen to be nearby a champion who other teammates are attacking. Probably to make their score look like they're trying. Consistently after a 20+ minute game they have 20-40 CS, 1 or 2 kills, 1 or 2 assists, a crazy number of deaths. Level around 8 - 10 range when everyone else is 14 - 18. They still buy items, again probably to make it look like they're not bots.
For as obvious as they are, they're trying really hard to not be obvious. Presumably this is allowing a few of them to get away with it because in most matches players may think they're just new / non-communicative. Furthermore, because I keep reporting them, presumably my reports are becoming less and less weighted. So by the time someone has enough information to say "hey these are bots I know exactly what they do" their reports are having minimal impact on actually getting them to the tribunal.
They don't all have a 4-digit number at the end of their name, but a large number of them do. (All four of the ones in my last match, for instance).